Header And Logo
|
#include "postgres.h"#include "access/htup_details.h"#include "access/xact.h"#include "catalog/pg_proc.h"#include "catalog/pg_type.h"#include "executor/functions.h"#include "funcapi.h"#include "miscadmin.h"#include "nodes/makefuncs.h"#include "nodes/nodeFuncs.h"#include "parser/parse_coerce.h"#include "parser/parse_func.h"#include "storage/proc.h"#include "tcop/utility.h"#include "utils/builtins.h"#include "utils/datum.h"#include "utils/lsyscache.h"#include "utils/memutils.h"#include "utils/snapmgr.h"#include "utils/syscache.h"
Go to the source code of this file.
| typedef struct execution_state execution_state |
| typedef SQLFunctionCache* SQLFunctionCachePtr |
Definition at line 128 of file functions.c.
| typedef struct SQLFunctionParseInfo SQLFunctionParseInfo |
| enum ExecStatus |
Definition at line 58 of file functions.c.
{
F_EXEC_START, F_EXEC_RUN, F_EXEC_DONE
} ExecStatus;
| bool check_sql_fn_retval | ( | Oid | func_id, | |
| Oid | rettype, | |||
| List * | queryTreeList, | |||
| bool * | modifyTargetList, | |||
| JunkFilter ** | junkFilter | |||
| ) |
Definition at line 1514 of file functions.c.
References Assert, AssertArg, tupleDesc::attrs, Query::canSetTag, CMD_DELETE, CMD_INSERT, CMD_SELECT, CMD_UPDATE, Query::commandType, CreateTupleDescCopy(), ereport, errcode(), errdetail(), errmsg(), ERROR, ExecCleanTargetListLength(), ExecInitJunkFilter(), ExecInitJunkFilterConversion(), TargetEntry::expr, exprType(), format_type_be(), get_func_result_type(), get_typcollation(), get_typtype(), INT4OID, InvalidOid, IsBinaryCoercible(), IsPolymorphicType, lappend(), lfirst, linitial, list_concat(), makeConst(), makeRelabelType(), makeTargetEntry(), tupleDesc::natts, NULL, RECORDOID, TargetEntry::resjunk, TargetEntry::resno, TargetEntry::ressortgroupref, Query::returningList, Query::setOperations, Query::targetList, TYPEFUNC_COMPOSITE, TYPTYPE_BASE, TYPTYPE_COMPOSITE, TYPTYPE_DOMAIN, TYPTYPE_ENUM, TYPTYPE_RANGE, Query::utilityStmt, and VOIDOID.
Referenced by fmgr_sql_validator(), init_sql_fcache(), inline_function(), and inline_set_returning_function().
{
Query *parse;
List **tlist_ptr;
List *tlist;
int tlistlen;
char fn_typtype;
Oid restype;
ListCell *lc;
AssertArg(!IsPolymorphicType(rettype));
if (modifyTargetList)
*modifyTargetList = false; /* initialize for no change */
if (junkFilter)
*junkFilter = NULL; /* initialize in case of VOID result */
/*
* Find the last canSetTag query in the list. This isn't necessarily the
* last parsetree, because rule rewriting can insert queries after what
* the user wrote.
*/
parse = NULL;
foreach(lc, queryTreeList)
{
Query *q = (Query *) lfirst(lc);
if (q->canSetTag)
parse = q;
}
/*
* If it's a plain SELECT, it returns whatever the targetlist says.
* Otherwise, if it's INSERT/UPDATE/DELETE with RETURNING, it returns
* that. Otherwise, the function return type must be VOID.
*
* Note: eventually replace this test with QueryReturnsTuples? We'd need
* a more general method of determining the output type, though. Also, it
* seems too dangerous to consider FETCH or EXECUTE as returning a
* determinable rowtype, since they depend on relatively short-lived
* entities.
*/
if (parse &&
parse->commandType == CMD_SELECT &&
parse->utilityStmt == NULL)
{
tlist_ptr = &parse->targetList;
tlist = parse->targetList;
}
else if (parse &&
(parse->commandType == CMD_INSERT ||
parse->commandType == CMD_UPDATE ||
parse->commandType == CMD_DELETE) &&
parse->returningList)
{
tlist_ptr = &parse->returningList;
tlist = parse->returningList;
}
else
{
/* Empty function body, or last statement is a utility command */
if (rettype != VOIDOID)
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("return type mismatch in function declared to return %s",
format_type_be(rettype)),
errdetail("Function's final statement must be SELECT or INSERT/UPDATE/DELETE RETURNING.")));
return false;
}
/*
* OK, check that the targetlist returns something matching the declared
* type. (We used to insist that the declared type not be VOID in this
* case, but that makes it hard to write a void function that exits after
* calling another void function. Instead, we insist that the tlist
* return void ... so void is treated as if it were a scalar type below.)
*/
/*
* Count the non-junk entries in the result targetlist.
*/
tlistlen = ExecCleanTargetListLength(tlist);
fn_typtype = get_typtype(rettype);
if (fn_typtype == TYPTYPE_BASE ||
fn_typtype == TYPTYPE_DOMAIN ||
fn_typtype == TYPTYPE_ENUM ||
fn_typtype == TYPTYPE_RANGE ||
rettype == VOIDOID)
{
/*
* For scalar-type returns, the target list must have exactly one
* non-junk entry, and its type must agree with what the user
* declared; except we allow binary-compatible types too.
*/
TargetEntry *tle;
if (tlistlen != 1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("return type mismatch in function declared to return %s",
format_type_be(rettype)),
errdetail("Final statement must return exactly one column.")));
/* We assume here that non-junk TLEs must come first in tlists */
tle = (TargetEntry *) linitial(tlist);
Assert(!tle->resjunk);
restype = exprType((Node *) tle->expr);
if (!IsBinaryCoercible(restype, rettype))
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("return type mismatch in function declared to return %s",
format_type_be(rettype)),
errdetail("Actual return type is %s.",
format_type_be(restype))));
if (modifyTargetList && restype != rettype)
{
tle->expr = (Expr *) makeRelabelType(tle->expr,
rettype,
-1,
get_typcollation(rettype),
COERCE_IMPLICIT_CAST);
/* Relabel is dangerous if TLE is a sort/group or setop column */
if (tle->ressortgroupref != 0 || parse->setOperations)
*modifyTargetList = true;
}
/* Set up junk filter if needed */
if (junkFilter)
*junkFilter = ExecInitJunkFilter(tlist, false, NULL);
}
else if (fn_typtype == TYPTYPE_COMPOSITE || rettype == RECORDOID)
{
/* Returns a rowtype */
TupleDesc tupdesc;
int tupnatts; /* physical number of columns in tuple */
int tuplogcols; /* # of nondeleted columns in tuple */
int colindex; /* physical column index */
List *newtlist; /* new non-junk tlist entries */
List *junkattrs; /* new junk tlist entries */
/*
* If the target list is of length 1, and the type of the varnode in
* the target list matches the declared return type, this is okay.
* This can happen, for example, where the body of the function is
* 'SELECT func2()', where func2 has the same composite return type as
* the function that's calling it.
*
* XXX Note that if rettype is RECORD, the IsBinaryCoercible check
* will succeed for any composite restype. For the moment we rely on
* runtime type checking to catch any discrepancy, but it'd be nice to
* do better at parse time.
*/
if (tlistlen == 1)
{
TargetEntry *tle = (TargetEntry *) linitial(tlist);
Assert(!tle->resjunk);
restype = exprType((Node *) tle->expr);
if (IsBinaryCoercible(restype, rettype))
{
if (modifyTargetList && restype != rettype)
{
tle->expr = (Expr *) makeRelabelType(tle->expr,
rettype,
-1,
get_typcollation(rettype),
COERCE_IMPLICIT_CAST);
/* Relabel is dangerous if sort/group or setop column */
if (tle->ressortgroupref != 0 || parse->setOperations)
*modifyTargetList = true;
}
/* Set up junk filter if needed */
if (junkFilter)
*junkFilter = ExecInitJunkFilter(tlist, false, NULL);
return false; /* NOT returning whole tuple */
}
}
/* Is the rowtype fixed, or determined only at runtime? */
if (get_func_result_type(func_id, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
{
/*
* Assume we are returning the whole tuple. Crosschecking against
* what the caller expects will happen at runtime.
*/
if (junkFilter)
*junkFilter = ExecInitJunkFilter(tlist, false, NULL);
return true;
}
Assert(tupdesc);
/*
* Verify that the targetlist matches the return tuple type. We scan
* the non-deleted attributes to ensure that they match the datatypes
* of the non-resjunk columns. For deleted attributes, insert NULL
* result columns if the caller asked for that.
*/
tupnatts = tupdesc->natts;
tuplogcols = 0; /* we'll count nondeleted cols as we go */
colindex = 0;
newtlist = NIL; /* these are only used if modifyTargetList */
junkattrs = NIL;
foreach(lc, tlist)
{
TargetEntry *tle = (TargetEntry *) lfirst(lc);
Form_pg_attribute attr;
Oid tletype;
Oid atttype;
if (tle->resjunk)
{
if (modifyTargetList)
junkattrs = lappend(junkattrs, tle);
continue;
}
do
{
colindex++;
if (colindex > tupnatts)
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("return type mismatch in function declared to return %s",
format_type_be(rettype)),
errdetail("Final statement returns too many columns.")));
attr = tupdesc->attrs[colindex - 1];
if (attr->attisdropped && modifyTargetList)
{
Expr *null_expr;
/* The type of the null we insert isn't important */
null_expr = (Expr *) makeConst(INT4OID,
-1,
InvalidOid,
sizeof(int32),
(Datum) 0,
true, /* isnull */
true /* byval */ );
newtlist = lappend(newtlist,
makeTargetEntry(null_expr,
colindex,
NULL,
false));
/* NULL insertion is dangerous in a setop */
if (parse->setOperations)
*modifyTargetList = true;
}
} while (attr->attisdropped);
tuplogcols++;
tletype = exprType((Node *) tle->expr);
atttype = attr->atttypid;
if (!IsBinaryCoercible(tletype, atttype))
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("return type mismatch in function declared to return %s",
format_type_be(rettype)),
errdetail("Final statement returns %s instead of %s at column %d.",
format_type_be(tletype),
format_type_be(atttype),
tuplogcols)));
if (modifyTargetList)
{
if (tletype != atttype)
{
tle->expr = (Expr *) makeRelabelType(tle->expr,
atttype,
-1,
get_typcollation(atttype),
COERCE_IMPLICIT_CAST);
/* Relabel is dangerous if sort/group or setop column */
if (tle->ressortgroupref != 0 || parse->setOperations)
*modifyTargetList = true;
}
tle->resno = colindex;
newtlist = lappend(newtlist, tle);
}
}
/* remaining columns in tupdesc had better all be dropped */
for (colindex++; colindex <= tupnatts; colindex++)
{
if (!tupdesc->attrs[colindex - 1]->attisdropped)
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("return type mismatch in function declared to return %s",
format_type_be(rettype)),
errdetail("Final statement returns too few columns.")));
if (modifyTargetList)
{
Expr *null_expr;
/* The type of the null we insert isn't important */
null_expr = (Expr *) makeConst(INT4OID,
-1,
InvalidOid,
sizeof(int32),
(Datum) 0,
true, /* isnull */
true /* byval */ );
newtlist = lappend(newtlist,
makeTargetEntry(null_expr,
colindex,
NULL,
false));
/* NULL insertion is dangerous in a setop */
if (parse->setOperations)
*modifyTargetList = true;
}
}
if (modifyTargetList)
{
/* ensure resjunk columns are numbered correctly */
foreach(lc, junkattrs)
{
TargetEntry *tle = (TargetEntry *) lfirst(lc);
tle->resno = colindex++;
}
/* replace the tlist with the modified one */
*tlist_ptr = list_concat(newtlist, junkattrs);
}
/* Set up junk filter if needed */
if (junkFilter)
*junkFilter = ExecInitJunkFilterConversion(tlist,
CreateTupleDescCopy(tupdesc),
NULL);
/* Report that we are returning entire tuple result */
return true;
}
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("return type %s is not supported for SQL functions",
format_type_be(rettype))));
return false;
}
| DestReceiver* CreateSQLFunctionDestReceiver | ( | void | ) |
Definition at line 1867 of file functions.c.
References palloc0().
Referenced by CreateDestReceiver().
{
DR_sqlfunction *self = (DR_sqlfunction *) palloc0(sizeof(DR_sqlfunction));
self->pub.receiveSlot = sqlfunction_receive;
self->pub.rStartup = sqlfunction_startup;
self->pub.rShutdown = sqlfunction_shutdown;
self->pub.rDestroy = sqlfunction_destroy;
self->pub.mydest = DestSQLFunction;
/* private fields will be set by postquel_start */
return (DestReceiver *) self;
}
| Datum fmgr_sql | ( | PG_FUNCTION_ARGS | ) |
Definition at line 972 of file functions.c.
References ReturnSetInfo::allowedModes, ErrorContextCallback::arg, Assert, ErrorContextCallback::callback, CommandCounterIncrement(), CreateTupleDescCopy(), ReturnSetInfo::econtext, elog, ereport, errcode(), errmsg(), ERROR, error_context_stack, F_EXEC_DONE, F_EXEC_START, SQLFunctionCache::fcontext, SQLFunctionCache::func_state, GetTransactionSnapshot(), init_sql_fcache(), IsA, ReturnSetInfo::isDone, JunkFilter::jf_cleanTupType, JunkFilter::jf_resultSlot, SQLFunctionCache::junkFilter, SQLFunctionCache::lazyEval, execution_state::lazyEval, lfirst, lnext, PGPROC::lxid, SQLFunctionCache::lxid, MemoryContextDelete(), MemoryContextSwitchTo(), MyProc, execution_state::next, NULL, PG_GET_COLLATION, PointerGetDatum, PopActiveSnapshot(), postquel_end(), postquel_get_single_result(), postquel_getnext(), postquel_start(), postquel_sub_params(), ErrorContextCallback::previous, PushActiveSnapshot(), execution_state::qd, SQLFunctionCache::readonly_func, RegisterExprContextCallback(), SQLFunctionCache::rettype, ReturnSetInfo::returnMode, SQLFunctionCache::returnsSet, ReturnSetInfo::setDesc, ReturnSetInfo::setResult, SFRM_Materialize, SQLFunctionCache::shutdown_reg, ShutdownSQLFunction(), QueryDesc::snapshot, execution_state::status, SubTransactionIsActive(), SQLFunctionCache::subxid, SQLFunctionCache::tstore, tuplestore_begin_heap(), tuplestore_clear(), tuplestore_gettupleslot(), UnregisterExprContextCallback(), UpdateActiveSnapshotCommandId(), VOIDOID, and work_mem.
{
SQLFunctionCachePtr fcache;
ErrorContextCallback sqlerrcontext;
MemoryContext oldcontext;
bool randomAccess;
bool lazyEvalOK;
bool is_first;
bool pushed_snapshot;
execution_state *es;
TupleTableSlot *slot;
Datum result;
List *eslist;
ListCell *eslc;
/*
* Setup error traceback support for ereport()
*/
sqlerrcontext.callback = sql_exec_error_callback;
sqlerrcontext.arg = fcinfo->flinfo;
sqlerrcontext.previous = error_context_stack;
error_context_stack = &sqlerrcontext;
/* Check call context */
if (fcinfo->flinfo->fn_retset)
{
ReturnSetInfo *rsi = (ReturnSetInfo *) fcinfo->resultinfo;
/*
* For simplicity, we require callers to support both set eval modes.
* There are cases where we must use one or must use the other, and
* it's not really worthwhile to postpone the check till we know. But
* note we do not require caller to provide an expectedDesc.
*/
if (!rsi || !IsA(rsi, ReturnSetInfo) ||
(rsi->allowedModes & SFRM_ValuePerCall) == 0 ||
(rsi->allowedModes & SFRM_Materialize) == 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("set-valued function called in context that cannot accept a set")));
randomAccess = rsi->allowedModes & SFRM_Materialize_Random;
lazyEvalOK = !(rsi->allowedModes & SFRM_Materialize_Preferred);
}
else
{
randomAccess = false;
lazyEvalOK = true;
}
/*
* Initialize fcache (build plans) if first time through; or re-initialize
* if the cache is stale.
*/
fcache = (SQLFunctionCachePtr) fcinfo->flinfo->fn_extra;
if (fcache != NULL)
{
if (fcache->lxid != MyProc->lxid ||
!SubTransactionIsActive(fcache->subxid))
{
/* It's stale; unlink and delete */
fcinfo->flinfo->fn_extra = NULL;
MemoryContextDelete(fcache->fcontext);
fcache = NULL;
}
}
if (fcache == NULL)
{
init_sql_fcache(fcinfo->flinfo, PG_GET_COLLATION(), lazyEvalOK);
fcache = (SQLFunctionCachePtr) fcinfo->flinfo->fn_extra;
}
/*
* Switch to context in which the fcache lives. This ensures that our
* tuplestore etc will have sufficient lifetime. The sub-executor is
* responsible for deleting per-tuple information. (XXX in the case of a
* long-lived FmgrInfo, this policy represents more memory leakage, but
* it's not entirely clear where to keep stuff instead.)
*/
oldcontext = MemoryContextSwitchTo(fcache->fcontext);
/*
* Find first unfinished query in function, and note whether it's the
* first query.
*/
eslist = fcache->func_state;
es = NULL;
is_first = true;
foreach(eslc, eslist)
{
es = (execution_state *) lfirst(eslc);
while (es && es->status == F_EXEC_DONE)
{
is_first = false;
es = es->next;
}
if (es)
break;
}
/*
* Convert params to appropriate format if starting a fresh execution. (If
* continuing execution, we can re-use prior params.)
*/
if (is_first && es && es->status == F_EXEC_START)
postquel_sub_params(fcache, fcinfo);
/*
* Build tuplestore to hold results, if we don't have one already. Note
* it's in the query-lifespan context.
*/
if (!fcache->tstore)
fcache->tstore = tuplestore_begin_heap(randomAccess, false, work_mem);
/*
* Execute each command in the function one after another until we either
* run out of commands or get a result row from a lazily-evaluated SELECT.
*
* Notes about snapshot management:
*
* In a read-only function, we just use the surrounding query's snapshot.
*
* In a non-read-only function, we rely on the fact that we'll never
* suspend execution between queries of the function: the only reason to
* suspend execution before completion is if we are returning a row from a
* lazily-evaluated SELECT. So, when first entering this loop, we'll
* either start a new query (and push a fresh snapshot) or re-establish
* the active snapshot from the existing query descriptor. If we need to
* start a new query in a subsequent execution of the loop, either we need
* a fresh snapshot (and pushed_snapshot is false) or the existing
* snapshot is on the active stack and we can just bump its command ID.
*/
pushed_snapshot = false;
while (es)
{
bool completed;
if (es->status == F_EXEC_START)
{
/*
* If not read-only, be sure to advance the command counter for
* each command, so that all work to date in this transaction is
* visible. Take a new snapshot if we don't have one yet,
* otherwise just bump the command ID in the existing snapshot.
*/
if (!fcache->readonly_func)
{
CommandCounterIncrement();
if (!pushed_snapshot)
{
PushActiveSnapshot(GetTransactionSnapshot());
pushed_snapshot = true;
}
else
UpdateActiveSnapshotCommandId();
}
postquel_start(es, fcache);
}
else if (!fcache->readonly_func && !pushed_snapshot)
{
/* Re-establish active snapshot when re-entering function */
PushActiveSnapshot(es->qd->snapshot);
pushed_snapshot = true;
}
completed = postquel_getnext(es, fcache);
/*
* If we ran the command to completion, we can shut it down now. Any
* row(s) we need to return are safely stashed in the tuplestore, and
* we want to be sure that, for example, AFTER triggers get fired
* before we return anything. Also, if the function doesn't return
* set, we can shut it down anyway because it must be a SELECT and we
* don't care about fetching any more result rows.
*/
if (completed || !fcache->returnsSet)
postquel_end(es);
/*
* Break from loop if we didn't shut down (implying we got a
* lazily-evaluated row). Otherwise we'll press on till the whole
* function is done, relying on the tuplestore to keep hold of the
* data to eventually be returned. This is necessary since an
* INSERT/UPDATE/DELETE RETURNING that sets the result might be
* followed by additional rule-inserted commands, and we want to
* finish doing all those commands before we return anything.
*/
if (es->status != F_EXEC_DONE)
break;
/*
* Advance to next execution_state, which might be in the next list.
*/
es = es->next;
while (!es)
{
eslc = lnext(eslc);
if (!eslc)
break; /* end of function */
es = (execution_state *) lfirst(eslc);
/*
* Flush the current snapshot so that we will take a new one for
* the new query list. This ensures that new snaps are taken at
* original-query boundaries, matching the behavior of interactive
* execution.
*/
if (pushed_snapshot)
{
PopActiveSnapshot();
pushed_snapshot = false;
}
}
}
/*
* The tuplestore now contains whatever row(s) we are supposed to return.
*/
if (fcache->returnsSet)
{
ReturnSetInfo *rsi = (ReturnSetInfo *) fcinfo->resultinfo;
if (es)
{
/*
* If we stopped short of being done, we must have a lazy-eval
* row.
*/
Assert(es->lazyEval);
/* Re-use the junkfilter's output slot to fetch back the tuple */
Assert(fcache->junkFilter);
slot = fcache->junkFilter->jf_resultSlot;
if (!tuplestore_gettupleslot(fcache->tstore, true, false, slot))
elog(ERROR, "failed to fetch lazy-eval tuple");
/* Extract the result as a datum, and copy out from the slot */
result = postquel_get_single_result(slot, fcinfo,
fcache, oldcontext);
/* Clear the tuplestore, but keep it for next time */
/* NB: this might delete the slot's content, but we don't care */
tuplestore_clear(fcache->tstore);
/*
* Let caller know we're not finished.
*/
rsi->isDone = ExprMultipleResult;
/*
* Ensure we will get shut down cleanly if the exprcontext is not
* run to completion.
*/
if (!fcache->shutdown_reg)
{
RegisterExprContextCallback(rsi->econtext,
ShutdownSQLFunction,
PointerGetDatum(fcache));
fcache->shutdown_reg = true;
}
}
else if (fcache->lazyEval)
{
/*
* We are done with a lazy evaluation. Clean up.
*/
tuplestore_clear(fcache->tstore);
/*
* Let caller know we're finished.
*/
rsi->isDone = ExprEndResult;
fcinfo->isnull = true;
result = (Datum) 0;
/* Deregister shutdown callback, if we made one */
if (fcache->shutdown_reg)
{
UnregisterExprContextCallback(rsi->econtext,
ShutdownSQLFunction,
PointerGetDatum(fcache));
fcache->shutdown_reg = false;
}
}
else
{
/*
* We are done with a non-lazy evaluation. Return whatever is in
* the tuplestore. (It is now caller's responsibility to free the
* tuplestore when done.)
*/
rsi->returnMode = SFRM_Materialize;
rsi->setResult = fcache->tstore;
fcache->tstore = NULL;
/* must copy desc because execQual will free it */
if (fcache->junkFilter)
rsi->setDesc = CreateTupleDescCopy(fcache->junkFilter->jf_cleanTupType);
fcinfo->isnull = true;
result = (Datum) 0;
/* Deregister shutdown callback, if we made one */
if (fcache->shutdown_reg)
{
UnregisterExprContextCallback(rsi->econtext,
ShutdownSQLFunction,
PointerGetDatum(fcache));
fcache->shutdown_reg = false;
}
}
}
else
{
/*
* Non-set function. If we got a row, return it; else return NULL.
*/
if (fcache->junkFilter)
{
/* Re-use the junkfilter's output slot to fetch back the tuple */
slot = fcache->junkFilter->jf_resultSlot;
if (tuplestore_gettupleslot(fcache->tstore, true, false, slot))
result = postquel_get_single_result(slot, fcinfo,
fcache, oldcontext);
else
{
fcinfo->isnull = true;
result = (Datum) 0;
}
}
else
{
/* Should only get here for VOID functions */
Assert(fcache->rettype == VOIDOID);
fcinfo->isnull = true;
result = (Datum) 0;
}
/* Clear the tuplestore, but keep it for next time */
tuplestore_clear(fcache->tstore);
}
/* Pop snapshot if we have pushed one */
if (pushed_snapshot)
PopActiveSnapshot();
/*
* If we've gone through every command in the function, we are done. Reset
* the execution states to start over again on next call.
*/
if (es == NULL)
{
foreach(eslc, fcache->func_state)
{
es = (execution_state *) lfirst(eslc);
while (es)
{
es->status = F_EXEC_START;
es = es->next;
}
}
}
error_context_stack = sqlerrcontext.previous;
MemoryContextSwitchTo(oldcontext);
return result;
}
| static List * init_execution_state | ( | List * | queryTree_list, | |
| SQLFunctionCachePtr | fcache, | |||
| bool | lazyEvalOK | |||
| ) | [static] |
Definition at line 464 of file functions.c.
References Assert, Query::canSetTag, CMD_SELECT, CMD_UTILITY, CommandIsReadOnly(), PlannedStmt::commandType, Query::commandType, CreateCommandTag(), ereport, errcode(), errmsg(), ERROR, PlannedStmt::hasModifyingCTE, IsA, SQLFunctionCache::junkFilter, lappend(), SQLFunctionCache::lazyEval, execution_state::lazyEval, lfirst, execution_state::next, NULL, palloc(), pg_plan_query(), execution_state::qd, SQLFunctionCache::readonly_func, execution_state::setsResult, execution_state::status, execution_state::stmt, PlannedStmt::utilityStmt, and Query::utilityStmt.
Referenced by init_sql_fcache().
{
List *eslist = NIL;
execution_state *lasttages = NULL;
ListCell *lc1;
foreach(lc1, queryTree_list)
{
List *qtlist = (List *) lfirst(lc1);
execution_state *firstes = NULL;
execution_state *preves = NULL;
ListCell *lc2;
foreach(lc2, qtlist)
{
Query *queryTree = (Query *) lfirst(lc2);
Node *stmt;
execution_state *newes;
Assert(IsA(queryTree, Query));
/* Plan the query if needed */
if (queryTree->commandType == CMD_UTILITY)
stmt = queryTree->utilityStmt;
else
stmt = (Node *) pg_plan_query(queryTree, 0, NULL);
/* Precheck all commands for validity in a function */
if (IsA(stmt, TransactionStmt))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
/* translator: %s is a SQL statement name */
errmsg("%s is not allowed in a SQL function",
CreateCommandTag(stmt))));
if (fcache->readonly_func && !CommandIsReadOnly(stmt))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
/* translator: %s is a SQL statement name */
errmsg("%s is not allowed in a non-volatile function",
CreateCommandTag(stmt))));
/* OK, build the execution_state for this query */
newes = (execution_state *) palloc(sizeof(execution_state));
if (preves)
preves->next = newes;
else
firstes = newes;
newes->next = NULL;
newes->status = F_EXEC_START;
newes->setsResult = false; /* might change below */
newes->lazyEval = false; /* might change below */
newes->stmt = stmt;
newes->qd = NULL;
if (queryTree->canSetTag)
lasttages = newes;
preves = newes;
}
eslist = lappend(eslist, firstes);
}
/*
* Mark the last canSetTag query as delivering the function result; then,
* if it is a plain SELECT, mark it for lazy evaluation. If it's not a
* SELECT we must always run it to completion.
*
* Note: at some point we might add additional criteria for whether to use
* lazy eval. However, we should prefer to use it whenever the function
* doesn't return set, since fetching more than one row is useless in that
* case.
*
* Note: don't set setsResult if the function returns VOID, as evidenced
* by not having made a junkfilter. This ensures we'll throw away any
* output from a utility statement that check_sql_fn_retval deemed to not
* have output.
*/
if (lasttages && fcache->junkFilter)
{
lasttages->setsResult = true;
if (lazyEvalOK &&
IsA(lasttages->stmt, PlannedStmt))
{
PlannedStmt *ps = (PlannedStmt *) lasttages->stmt;
if (ps->commandType == CMD_SELECT &&
ps->utilityStmt == NULL &&
!ps->hasModifyingCTE)
fcache->lazyEval = lasttages->lazyEval = true;
}
}
return eslist;
}
Definition at line 568 of file functions.c.
References ALLOCSET_DEFAULT_INITSIZE, ALLOCSET_DEFAULT_MAXSIZE, ALLOCSET_DEFAULT_MINSIZE, AllocSetContextCreate(), Anum_pg_proc_prosrc, BlessTupleDesc(), check_sql_fn_retval(), elog, ereport, errcode(), errmsg(), ERROR, SQLFunctionCache::fcontext, FmgrInfo::fn_expr, FmgrInfo::fn_extra, FmgrInfo::fn_mcxt, FmgrInfo::fn_oid, SQLFunctionCache::fname, format_type_be(), SQLFunctionCache::func_state, get_fn_expr_rettype(), get_typlenbyval(), GetCurrentSubTransactionId(), GETSTRUCT, HeapTupleIsValid, init_execution_state(), InvalidOid, IsPolymorphicType, JunkFilter::jf_resultSlot, SQLFunctionCache::junkFilter, lappend(), lfirst, list_concat(), list_copy(), PGPROC::lxid, SQLFunctionCache::lxid, MemoryContextSwitchTo(), MyProc, NameStr, NULL, ObjectIdGetDatum, palloc0(), pg_analyze_and_rewrite_params(), pg_parse_query(), SQLFunctionCache::pinfo, prepare_sql_fn_parse_info(), PROCOID, pstrdup(), SQLFunctionCache::readonly_func, ReleaseSysCache(), SQLFunctionCache::rettype, SQLFunctionCache::returnsSet, SQLFunctionCache::returnsTuple, SearchSysCache1, sql_fn_parser_setup(), SQLFunctionCache::src, SQLFunctionCache::subxid, SysCacheGetAttr(), TextDatumGetCString, TupleTableSlot::tts_tupleDescriptor, SQLFunctionCache::typbyval, type_is_rowtype(), and SQLFunctionCache::typlen.
Referenced by fmgr_sql().
{
Oid foid = finfo->fn_oid;
MemoryContext fcontext;
MemoryContext oldcontext;
Oid rettype;
HeapTuple procedureTuple;
Form_pg_proc procedureStruct;
SQLFunctionCachePtr fcache;
List *raw_parsetree_list;
List *queryTree_list;
List *flat_query_list;
ListCell *lc;
Datum tmp;
bool isNull;
/*
* Create memory context that holds all the SQLFunctionCache data. It
* must be a child of whatever context holds the FmgrInfo.
*/
fcontext = AllocSetContextCreate(finfo->fn_mcxt,
"SQL function data",
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
oldcontext = MemoryContextSwitchTo(fcontext);
/*
* Create the struct proper, link it to fcontext and fn_extra. Once this
* is done, we'll be able to recover the memory after failure, even if the
* FmgrInfo is long-lived.
*/
fcache = (SQLFunctionCachePtr) palloc0(sizeof(SQLFunctionCache));
fcache->fcontext = fcontext;
finfo->fn_extra = (void *) fcache;
/*
* get the procedure tuple corresponding to the given function Oid
*/
procedureTuple = SearchSysCache1(PROCOID, ObjectIdGetDatum(foid));
if (!HeapTupleIsValid(procedureTuple))
elog(ERROR, "cache lookup failed for function %u", foid);
procedureStruct = (Form_pg_proc) GETSTRUCT(procedureTuple);
/*
* copy function name immediately for use by error reporting callback
*/
fcache->fname = pstrdup(NameStr(procedureStruct->proname));
/*
* get the result type from the procedure tuple, and check for polymorphic
* result type; if so, find out the actual result type.
*/
rettype = procedureStruct->prorettype;
if (IsPolymorphicType(rettype))
{
rettype = get_fn_expr_rettype(finfo);
if (rettype == InvalidOid) /* this probably should not happen */
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("could not determine actual result type for function declared to return type %s",
format_type_be(procedureStruct->prorettype))));
}
fcache->rettype = rettype;
/* Fetch the typlen and byval info for the result type */
get_typlenbyval(rettype, &fcache->typlen, &fcache->typbyval);
/* Remember whether we're returning setof something */
fcache->returnsSet = procedureStruct->proretset;
/* Remember if function is STABLE/IMMUTABLE */
fcache->readonly_func =
(procedureStruct->provolatile != PROVOLATILE_VOLATILE);
/*
* We need the actual argument types to pass to the parser. Also make
* sure that parameter symbols are considered to have the function's
* resolved input collation.
*/
fcache->pinfo = prepare_sql_fn_parse_info(procedureTuple,
finfo->fn_expr,
collation);
/*
* And of course we need the function body text.
*/
tmp = SysCacheGetAttr(PROCOID,
procedureTuple,
Anum_pg_proc_prosrc,
&isNull);
if (isNull)
elog(ERROR, "null prosrc for function %u", foid);
fcache->src = TextDatumGetCString(tmp);
/*
* Parse and rewrite the queries in the function text. Use sublists to
* keep track of the original query boundaries. But we also build a
* "flat" list of the rewritten queries to pass to check_sql_fn_retval.
* This is because the last canSetTag query determines the result type
* independently of query boundaries --- and it might not be in the last
* sublist, for example if the last query rewrites to DO INSTEAD NOTHING.
* (It might not be unreasonable to throw an error in such a case, but
* this is the historical behavior and it doesn't seem worth changing.)
*
* Note: since parsing and planning is done in fcontext, we will generate
* a lot of cruft that lives as long as the fcache does. This is annoying
* but we'll not worry about it until the module is rewritten to use
* plancache.c.
*/
raw_parsetree_list = pg_parse_query(fcache->src);
queryTree_list = NIL;
flat_query_list = NIL;
foreach(lc, raw_parsetree_list)
{
Node *parsetree = (Node *) lfirst(lc);
List *queryTree_sublist;
queryTree_sublist = pg_analyze_and_rewrite_params(parsetree,
fcache->src,
(ParserSetupHook) sql_fn_parser_setup,
fcache->pinfo);
queryTree_list = lappend(queryTree_list, queryTree_sublist);
flat_query_list = list_concat(flat_query_list,
list_copy(queryTree_sublist));
}
/*
* Check that the function returns the type it claims to. Although in
* simple cases this was already done when the function was defined, we
* have to recheck because database objects used in the function's queries
* might have changed type. We'd have to do it anyway if the function had
* any polymorphic arguments.
*
* Note: we set fcache->returnsTuple according to whether we are returning
* the whole tuple result or just a single column. In the latter case we
* clear returnsTuple because we need not act different from the scalar
* result case, even if it's a rowtype column. (However, we have to force
* lazy eval mode in that case; otherwise we'd need extra code to expand
* the rowtype column into multiple columns, since we have no way to
* notify the caller that it should do that.)
*
* check_sql_fn_retval will also construct a JunkFilter we can use to
* coerce the returned rowtype to the desired form (unless the result type
* is VOID, in which case there's nothing to coerce to).
*/
fcache->returnsTuple = check_sql_fn_retval(foid,
rettype,
flat_query_list,
NULL,
&fcache->junkFilter);
if (fcache->returnsTuple)
{
/* Make sure output rowtype is properly blessed */
BlessTupleDesc(fcache->junkFilter->jf_resultSlot->tts_tupleDescriptor);
}
else if (fcache->returnsSet && type_is_rowtype(fcache->rettype))
{
/*
* Returning rowtype as if it were scalar --- materialize won't work.
* Right now it's sufficient to override any caller preference for
* materialize mode, but to add more smarts in init_execution_state
* about this, we'd probably need a three-way flag instead of bool.
*/
lazyEvalOK = true;
}
/* Finally, plan the queries */
fcache->func_state = init_execution_state(queryTree_list,
fcache,
lazyEvalOK);
/* Mark fcache with time of creation to show it's valid */
fcache->lxid = MyProc->lxid;
fcache->subxid = GetCurrentSubTransactionId();
ReleaseSysCache(procedureTuple);
MemoryContextSwitchTo(oldcontext);
}
| static void postquel_end | ( | execution_state * | es | ) | [static] |
Definition at line 859 of file functions.c.
References QueryDesc::dest, ExecutorEnd(), ExecutorFinish(), FreeQueryDesc(), NULL, execution_state::qd, _DestReceiver::rDestroy, execution_state::status, and QueryDesc::utilitystmt.
Referenced by fmgr_sql(), and ShutdownSQLFunction().
{
/* mark status done to ensure we don't do ExecutorEnd twice */
es->status = F_EXEC_DONE;
/* Utility commands don't need Executor. */
if (es->qd->utilitystmt == NULL)
{
ExecutorFinish(es->qd);
ExecutorEnd(es->qd);
}
(*es->qd->dest->rDestroy) (es->qd->dest);
FreeQueryDesc(es->qd);
es->qd = NULL;
}
| static Datum postquel_get_single_result | ( | TupleTableSlot * | slot, | |
| FunctionCallInfo | fcinfo, | |||
| SQLFunctionCachePtr | fcache, | |||
| MemoryContext | resultcontext | |||
| ) | [static] |
Definition at line 928 of file functions.c.
References datumCopy(), ExecFetchSlotTupleDatum(), FunctionCallInfoData::isnull, MemoryContextSwitchTo(), SQLFunctionCache::returnsTuple, slot_getattr(), SQLFunctionCache::typbyval, SQLFunctionCache::typlen, and value.
Referenced by fmgr_sql().
{
Datum value;
MemoryContext oldcontext;
/*
* Set up to return the function value. For pass-by-reference datatypes,
* be sure to allocate the result in resultcontext, not the current memory
* context (which has query lifespan). We can't leave the data in the
* TupleTableSlot because we intend to clear the slot before returning.
*/
oldcontext = MemoryContextSwitchTo(resultcontext);
if (fcache->returnsTuple)
{
/* We must return the whole tuple as a Datum. */
fcinfo->isnull = false;
value = ExecFetchSlotTupleDatum(slot);
value = datumCopy(value, fcache->typbyval, fcache->typlen);
}
else
{
/*
* Returning a scalar, which we have to extract from the first column
* of the SELECT result, and then copy into result context if needed.
*/
value = slot_getattr(slot, 1, &(fcinfo->isnull));
if (!fcinfo->isnull)
value = datumCopy(value, fcache->typbyval, fcache->typlen);
}
MemoryContextSwitchTo(oldcontext);
return value;
}
| static bool postquel_getnext | ( | execution_state * | es, | |
| SQLFunctionCachePtr | fcache | |||
| ) | [static] |
Definition at line 823 of file functions.c.
References QueryDesc::dest, EState::es_processed, QueryDesc::estate, ExecutorRun(), ForwardScanDirection, execution_state::lazyEval, NULL, QueryDesc::params, QueryDesc::plannedstmt, PROCESS_UTILITY_QUERY, ProcessUtility(), execution_state::qd, SQLFunctionCache::src, and QueryDesc::utilitystmt.
Referenced by fmgr_sql().
{
bool result;
if (es->qd->utilitystmt)
{
/* ProcessUtility needs the PlannedStmt for DECLARE CURSOR */
ProcessUtility((es->qd->plannedstmt ?
(Node *) es->qd->plannedstmt :
es->qd->utilitystmt),
fcache->src,
PROCESS_UTILITY_QUERY,
es->qd->params,
es->qd->dest,
NULL);
result = true; /* never stops early */
}
else
{
/* Run regular commands to completion unless lazyEval */
long count = (es->lazyEval) ? 1L : 0L;
ExecutorRun(es->qd, ForwardScanDirection, count);
/*
* If we requested run to completion OR there was no tuple returned,
* command must be complete.
*/
result = (count == 0L || es->qd->estate->es_processed == 0);
}
return result;
}
| static void postquel_start | ( | execution_state * | es, | |
| SQLFunctionCachePtr | fcache | |||
| ) | [static] |
Definition at line 756 of file functions.c.
References ActiveSnapshotSet(), Assert, CreateDestReceiver(), CreateQueryDesc(), CreateUtilityQueryDesc(), CurrentMemoryContext, DR_sqlfunction::cxt, DestSQLFunction, ExecutorStart(), DR_sqlfunction::filter, GetActiveSnapshot(), InvalidSnapshot, IsA, SQLFunctionCache::junkFilter, execution_state::lazyEval, _DestReceiver::mydest, None_Receiver, NULL, SQLFunctionCache::paramLI, DR_sqlfunction::pub, execution_state::qd, execution_state::setsResult, SQLFunctionCache::src, execution_state::status, execution_state::stmt, SQLFunctionCache::tstore, DR_sqlfunction::tstore, and QueryDesc::utilitystmt.
Referenced by fmgr_sql().
{
DestReceiver *dest;
Assert(es->qd == NULL);
/* Caller should have ensured a suitable snapshot is active */
Assert(ActiveSnapshotSet());
/*
* If this query produces the function result, send its output to the
* tuplestore; else discard any output.
*/
if (es->setsResult)
{
DR_sqlfunction *myState;
dest = CreateDestReceiver(DestSQLFunction);
/* pass down the needed info to the dest receiver routines */
myState = (DR_sqlfunction *) dest;
Assert(myState->pub.mydest == DestSQLFunction);
myState->tstore = fcache->tstore;
myState->cxt = CurrentMemoryContext;
myState->filter = fcache->junkFilter;
}
else
dest = None_Receiver;
if (IsA(es->stmt, PlannedStmt))
es->qd = CreateQueryDesc((PlannedStmt *) es->stmt,
fcache->src,
GetActiveSnapshot(),
InvalidSnapshot,
dest,
fcache->paramLI, 0);
else
es->qd = CreateUtilityQueryDesc(es->stmt,
fcache->src,
GetActiveSnapshot(),
dest,
fcache->paramLI);
/* Utility commands don't need Executor. */
if (es->qd->utilitystmt == NULL)
{
/*
* In lazyEval mode, do not let the executor set up an AfterTrigger
* context. This is necessary not just an optimization, because we
* mustn't exit from the function execution with a stacked
* AfterTrigger level still active. We are careful not to select
* lazyEval mode for any statement that could possibly queue triggers.
*/
int eflags;
if (es->lazyEval)
eflags = EXEC_FLAG_SKIP_TRIGGERS;
else
eflags = 0; /* default run-to-completion flags */
ExecutorStart(es->qd, eflags);
}
es->status = F_EXEC_RUN;
}
| static void postquel_sub_params | ( | SQLFunctionCachePtr | fcache, | |
| FunctionCallInfo | fcinfo | |||
| ) | [static] |
Definition at line 879 of file functions.c.
References FunctionCallInfoData::arg, FunctionCallInfoData::argnull, SQLFunctionParseInfo::argtypes, Assert, i, ParamExternData::isnull, FunctionCallInfoData::nargs, NULL, ParamListInfoData::numParams, palloc(), ParamListInfoData::paramFetch, ParamListInfoData::paramFetchArg, SQLFunctionCache::paramLI, ParamListInfoData::params, ParamListInfoData::parserSetup, ParamListInfoData::parserSetupArg, ParamExternData::pflags, SQLFunctionCache::pinfo, ParamExternData::ptype, and ParamExternData::value.
Referenced by fmgr_sql().
{
int nargs = fcinfo->nargs;
if (nargs > 0)
{
ParamListInfo paramLI;
int i;
if (fcache->paramLI == NULL)
{
/* sizeof(ParamListInfoData) includes the first array element */
paramLI = (ParamListInfo) palloc(sizeof(ParamListInfoData) +
(nargs - 1) * sizeof(ParamExternData));
/* we have static list of params, so no hooks needed */
paramLI->paramFetch = NULL;
paramLI->paramFetchArg = NULL;
paramLI->parserSetup = NULL;
paramLI->parserSetupArg = NULL;
paramLI->numParams = nargs;
fcache->paramLI = paramLI;
}
else
{
paramLI = fcache->paramLI;
Assert(paramLI->numParams == nargs);
}
for (i = 0; i < nargs; i++)
{
ParamExternData *prm = ¶mLI->params[i];
prm->value = fcinfo->arg[i];
prm->isnull = fcinfo->argnull[i];
prm->pflags = 0;
prm->ptype = fcache->pinfo->argtypes[i];
}
}
else
fcache->paramLI = NULL;
}
| SQLFunctionParseInfoPtr prepare_sql_fn_parse_info | ( | HeapTuple | procedureTuple, | |
| Node * | call_expr, | |||
| Oid | inputCollation | |||
| ) |
Definition at line 184 of file functions.c.
References Anum_pg_proc_proargmodes, Anum_pg_proc_proargnames, SQLFunctionParseInfo::argnames, SQLFunctionParseInfo::argtypes, SQLFunctionParseInfo::collation, ereport, errcode(), errmsg(), ERROR, SQLFunctionParseInfo::fname, format_type_be(), get_call_expr_argtype(), get_func_input_arg_names(), GETSTRUCT, InvalidOid, IsPolymorphicType, NameStr, SQLFunctionParseInfo::nargs, NULL, palloc(), palloc0(), PointerGetDatum, PROCNAMEARGSNSP, pstrdup(), and SysCacheGetAttr().
Referenced by fmgr_sql_validator(), init_sql_fcache(), inline_function(), and inline_set_returning_function().
{
SQLFunctionParseInfoPtr pinfo;
Form_pg_proc procedureStruct = (Form_pg_proc) GETSTRUCT(procedureTuple);
int nargs;
pinfo = (SQLFunctionParseInfoPtr) palloc0(sizeof(SQLFunctionParseInfo));
/* Function's name (only) can be used to qualify argument names */
pinfo->fname = pstrdup(NameStr(procedureStruct->proname));
/* Save the function's input collation */
pinfo->collation = inputCollation;
/*
* Copy input argument types from the pg_proc entry, then resolve any
* polymorphic types.
*/
pinfo->nargs = nargs = procedureStruct->pronargs;
if (nargs > 0)
{
Oid *argOidVect;
int argnum;
argOidVect = (Oid *) palloc(nargs * sizeof(Oid));
memcpy(argOidVect,
procedureStruct->proargtypes.values,
nargs * sizeof(Oid));
for (argnum = 0; argnum < nargs; argnum++)
{
Oid argtype = argOidVect[argnum];
if (IsPolymorphicType(argtype))
{
argtype = get_call_expr_argtype(call_expr, argnum);
if (argtype == InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("could not determine actual type of argument declared %s",
format_type_be(argOidVect[argnum]))));
argOidVect[argnum] = argtype;
}
}
pinfo->argtypes = argOidVect;
}
/*
* Collect names of arguments, too, if any
*/
if (nargs > 0)
{
Datum proargnames;
Datum proargmodes;
int n_arg_names;
bool isNull;
proargnames = SysCacheGetAttr(PROCNAMEARGSNSP, procedureTuple,
Anum_pg_proc_proargnames,
&isNull);
if (isNull)
proargnames = PointerGetDatum(NULL); /* just to be sure */
proargmodes = SysCacheGetAttr(PROCNAMEARGSNSP, procedureTuple,
Anum_pg_proc_proargmodes,
&isNull);
if (isNull)
proargmodes = PointerGetDatum(NULL); /* just to be sure */
n_arg_names = get_func_input_arg_names(proargnames, proargmodes,
&pinfo->argnames);
/* Paranoia: ignore the result if too few array entries */
if (n_arg_names < nargs)
pinfo->argnames = NULL;
}
else
pinfo->argnames = NULL;
return pinfo;
}
| static void ShutdownSQLFunction | ( | Datum | arg | ) | [static] |
Definition at line 1431 of file functions.c.
References DatumGetPointer, F_EXEC_RUN, SQLFunctionCache::func_state, lfirst, execution_state::next, PopActiveSnapshot(), postquel_end(), PushActiveSnapshot(), execution_state::qd, SQLFunctionCache::readonly_func, SQLFunctionCache::shutdown_reg, QueryDesc::snapshot, execution_state::status, SQLFunctionCache::tstore, and tuplestore_end().
Referenced by fmgr_sql().
{
SQLFunctionCachePtr fcache = (SQLFunctionCachePtr) DatumGetPointer(arg);
execution_state *es;
ListCell *lc;
foreach(lc, fcache->func_state)
{
es = (execution_state *) lfirst(lc);
while (es)
{
/* Shut down anything still running */
if (es->status == F_EXEC_RUN)
{
/* Re-establish active snapshot for any called functions */
if (!fcache->readonly_func)
PushActiveSnapshot(es->qd->snapshot);
postquel_end(es);
if (!fcache->readonly_func)
PopActiveSnapshot();
}
/* Reset states to START in case we're called again */
es->status = F_EXEC_START;
es = es->next;
}
}
/* Release tuplestore if we have one */
if (fcache->tstore)
tuplestore_end(fcache->tstore);
fcache->tstore = NULL;
/* execUtils will deregister the callback... */
fcache->shutdown_reg = false;
}
| static void sql_exec_error_callback | ( | void * | arg | ) | [static] |
Definition at line 1349 of file functions.c.
References errcontext, errposition(), FmgrInfo::fn_extra, SQLFunctionCache::fname, SQLFunctionCache::func_state, geterrposition(), internalerrposition(), internalerrquery(), lfirst, execution_state::next, NULL, execution_state::qd, and SQLFunctionCache::src.
{
FmgrInfo *flinfo = (FmgrInfo *) arg;
SQLFunctionCachePtr fcache = (SQLFunctionCachePtr) flinfo->fn_extra;
int syntaxerrposition;
/*
* We can do nothing useful if init_sql_fcache() didn't get as far as
* saving the function name
*/
if (fcache == NULL || fcache->fname == NULL)
return;
/*
* If there is a syntax error position, convert to internal syntax error
*/
syntaxerrposition = geterrposition();
if (syntaxerrposition > 0 && fcache->src != NULL)
{
errposition(0);
internalerrposition(syntaxerrposition);
internalerrquery(fcache->src);
}
/*
* Try to determine where in the function we failed. If there is a query
* with non-null QueryDesc, finger it. (We check this rather than looking
* for F_EXEC_RUN state, so that errors during ExecutorStart or
* ExecutorEnd are blamed on the appropriate query; see postquel_start and
* postquel_end.)
*/
if (fcache->func_state)
{
execution_state *es;
int query_num;
ListCell *lc;
es = NULL;
query_num = 1;
foreach(lc, fcache->func_state)
{
es = (execution_state *) lfirst(lc);
while (es)
{
if (es->qd)
{
errcontext("SQL function \"%s\" statement %d",
fcache->fname, query_num);
break;
}
es = es->next;
}
if (es)
break;
query_num++;
}
if (es == NULL)
{
/*
* couldn't identify a running query; might be function entry,
* function exit, or between queries.
*/
errcontext("SQL function \"%s\"", fcache->fname);
}
}
else
{
/*
* Assume we failed during init_sql_fcache(). (It's possible that the
* function actually has an empty body, but in that case we may as
* well report all errors as being "during startup".)
*/
errcontext("SQL function \"%s\" during startup", fcache->fname);
}
}
| static Node * sql_fn_make_param | ( | SQLFunctionParseInfoPtr | pinfo, | |
| int | paramno, | |||
| int | location | |||
| ) | [static] |
Definition at line 410 of file functions.c.
References SQLFunctionParseInfo::argtypes, SQLFunctionParseInfo::collation, get_typcollation(), Param::location, makeNode, OidIsValid, Param::paramcollid, Param::paramid, Param::paramkind, Param::paramtype, and Param::paramtypmod.
Referenced by sql_fn_param_ref(), and sql_fn_resolve_param_name().
{
Param *param;
param = makeNode(Param);
param->paramkind = PARAM_EXTERN;
param->paramid = paramno;
param->paramtype = pinfo->argtypes[paramno - 1];
param->paramtypmod = -1;
param->paramcollid = get_typcollation(param->paramtype);
param->location = location;
/*
* If we have a function input collation, allow it to override the
* type-derived collation for parameter symbols. (XXX perhaps this should
* not happen if the type collation is not default?)
*/
if (OidIsValid(pinfo->collation) && OidIsValid(param->paramcollid))
param->paramcollid = pinfo->collation;
return (Node *) param;
}
| static Node * sql_fn_param_ref | ( | ParseState * | pstate, | |
| ParamRef * | pref | |||
| ) | [static] |
Definition at line 394 of file functions.c.
References ParamRef::location, SQLFunctionParseInfo::nargs, ParamRef::number, ParseState::p_ref_hook_state, and sql_fn_make_param().
{
SQLFunctionParseInfoPtr pinfo = (SQLFunctionParseInfoPtr) pstate->p_ref_hook_state;
int paramno = pref->number;
/* Check parameter number is valid */
if (paramno <= 0 || paramno > pinfo->nargs)
return NULL; /* unknown parameter number */
return sql_fn_make_param(pinfo, paramno, pref->location);
}
| void sql_fn_parser_setup | ( | struct ParseState * | pstate, | |
| SQLFunctionParseInfoPtr | pinfo | |||
| ) |
Definition at line 273 of file functions.c.
References ParseState::p_paramref_hook, ParseState::p_post_columnref_hook, ParseState::p_pre_columnref_hook, and ParseState::p_ref_hook_state.
Referenced by fmgr_sql_validator(), init_sql_fcache(), inline_function(), and inline_set_returning_function().
{
pstate->p_pre_columnref_hook = NULL;
pstate->p_post_columnref_hook = sql_fn_post_column_ref;
pstate->p_paramref_hook = sql_fn_param_ref;
/* no need to use p_coerce_param_hook */
pstate->p_ref_hook_state = (void *) pinfo;
}
| static Node * sql_fn_post_column_ref | ( | ParseState * | pstate, | |
| ColumnRef * | cref, | |||
| Node * | var | |||
| ) | [static] |
Definition at line 286 of file functions.c.
References Assert, ColumnRef::fields, SQLFunctionParseInfo::fname, IsA, linitial, list_length(), list_make1, ColumnRef::location, lsecond, lthird, NIL, NULL, ParseState::p_ref_hook_state, ParseFuncOrColumn(), sql_fn_resolve_param_name(), and strVal.
{
SQLFunctionParseInfoPtr pinfo = (SQLFunctionParseInfoPtr) pstate->p_ref_hook_state;
int nnames;
Node *field1;
Node *subfield = NULL;
const char *name1;
const char *name2 = NULL;
Node *param;
/*
* Never override a table-column reference. This corresponds to
* considering the parameter names to appear in a scope outside the
* individual SQL commands, which is what we want.
*/
if (var != NULL)
return NULL;
/*----------
* The allowed syntaxes are:
*
* A A = parameter name
* A.B A = function name, B = parameter name
* OR: A = record-typed parameter name, B = field name
* (the first possibility takes precedence)
* A.B.C A = function name, B = record-typed parameter name,
* C = field name
*----------
*/
nnames = list_length(cref->fields);
if (nnames > 3)
return NULL;
field1 = (Node *) linitial(cref->fields);
Assert(IsA(field1, String));
name1 = strVal(field1);
if (nnames > 1)
{
subfield = (Node *) lsecond(cref->fields);
Assert(IsA(subfield, String));
name2 = strVal(subfield);
}
if (nnames == 3)
{
/*
* Three-part name: if the first part doesn't match the function name,
* we can fail immediately. Otherwise, look up the second part, and
* take the third part to be a field reference.
*/
if (strcmp(name1, pinfo->fname) != 0)
return NULL;
param = sql_fn_resolve_param_name(pinfo, name2, cref->location);
subfield = (Node *) lthird(cref->fields);
Assert(IsA(subfield, String));
}
else if (nnames == 2 && strcmp(name1, pinfo->fname) == 0)
{
/*
* Two-part name with first part matching function name: first see if
* second part matches any parameter name.
*/
param = sql_fn_resolve_param_name(pinfo, name2, cref->location);
if (param)
{
/* Yes, so this is a parameter reference, no subfield */
subfield = NULL;
}
else
{
/* No, so try to match as parameter name and subfield */
param = sql_fn_resolve_param_name(pinfo, name1, cref->location);
}
}
else
{
/* Single name, or parameter name followed by subfield */
param = sql_fn_resolve_param_name(pinfo, name1, cref->location);
}
if (!param)
return NULL; /* No match */
if (subfield)
{
/*
* Must be a reference to a field of a composite parameter; otherwise
* ParseFuncOrColumn will return NULL, and we'll fail back at the
* caller.
*/
param = ParseFuncOrColumn(pstate,
list_make1(subfield),
list_make1(param),
NIL, false, false, false,
NULL, true, cref->location);
}
return param;
}
| static Node * sql_fn_resolve_param_name | ( | SQLFunctionParseInfoPtr | pinfo, | |
| const char * | paramname, | |||
| int | location | |||
| ) | [static] |
Definition at line 440 of file functions.c.
References SQLFunctionParseInfo::argnames, i, SQLFunctionParseInfo::nargs, NULL, and sql_fn_make_param().
Referenced by sql_fn_post_column_ref().
| static void sqlfunction_destroy | ( | DestReceiver * | self | ) | [static] |
| static void sqlfunction_receive | ( | TupleTableSlot * | slot, | |
| DestReceiver * | self | |||
| ) | [static] |
Definition at line 1895 of file functions.c.
References ExecFilterJunk(), DR_sqlfunction::filter, DR_sqlfunction::tstore, and tuplestore_puttupleslot().
{
DR_sqlfunction *myState = (DR_sqlfunction *) self;
/* Filter tuple as needed */
slot = ExecFilterJunk(myState->filter, slot);
/* Store the filtered tuple into the tuplestore */
tuplestore_puttupleslot(myState->tstore, slot);
}
| static void sqlfunction_shutdown | ( | DestReceiver * | self | ) | [static] |
Definition at line 1910 of file functions.c.
{
/* no-op */
}
| static void sqlfunction_startup | ( | DestReceiver * | self, | |
| int | operation, | |||
| TupleDesc | typeinfo | |||
| ) | [static] |
Definition at line 1886 of file functions.c.
{
/* no-op */
}
1.7.1