* INTERFACE ROUTINES
* ExecutorStart()
* ExecutorRun()
+ * ExecutorFinish()
* ExecutorEnd()
*
- * The old ExecutorMain() has been replaced by ExecutorStart(),
- * ExecutorRun() and ExecutorEnd()
- *
- * These three procedures are the external interfaces to the executor.
+ * These four procedures are the external interface to the executor.
* In each case, the query descriptor is required as an argument.
*
- * ExecutorStart() must be called at the beginning of execution of any
- * query plan and ExecutorEnd() should always be called at the end of
- * execution of a plan.
+ * ExecutorStart must be called at the beginning of execution of any
+ * query plan and ExecutorEnd must always be called at the end of
+ * execution of a plan (unless it is aborted due to error).
*
* ExecutorRun accepts direction and count arguments that specify whether
* the plan is to be executed forwards, backwards, and for how many tuples.
+ * In some cases ExecutorRun may be called multiple times to process all
+ * the tuples for a plan. It is also acceptable to stop short of executing
+ * the whole plan (but only if it is a SELECT).
+ *
+ * ExecutorFinish must be called after the final ExecutorRun call and
+ * before ExecutorEnd. This can be omitted only in case of EXPLAIN,
+ * which should also omit ExecutorRun.
*
- * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.339 2010/01/02 16:57:40 momjian Exp $
+ * src/backend/executor/execMain.c
*
*-------------------------------------------------------------------------
*/
#include "parser/parsetree.h"
#include "storage/bufmgr.h"
#include "storage/lmgr.h"
+#include "storage/smgr.h"
+#include "tcop/utility.h"
#include "utils/acl.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/tqual.h"
-/* Hooks for plugins to get control in ExecutorStart/Run/End() */
+/* Hooks for plugins to get control in ExecutorStart/Run/Finish/End */
ExecutorStart_hook_type ExecutorStart_hook = NULL;
ExecutorRun_hook_type ExecutorRun_hook = NULL;
+ExecutorFinish_hook_type ExecutorFinish_hook = NULL;
ExecutorEnd_hook_type ExecutorEnd_hook = NULL;
+/* Hook for plugin to get control in ExecCheckRTPerms() */
+ExecutorCheckPerms_hook_type ExecutorCheckPerms_hook = NULL;
+
/* decls for local routines only used within this module */
static void InitPlan(QueryDesc *queryDesc, int eflags);
+static void CheckValidRowMarkRel(Relation rel, RowMarkType markType);
+static void ExecPostprocessPlan(EState *estate);
static void ExecEndPlan(PlanState *planstate, EState *estate);
static void ExecutePlan(EState *estate, PlanState *planstate,
CmdType operation,
long numberTuples,
ScanDirection direction,
DestReceiver *dest);
-static void ExecCheckRTPerms(List *rangeTable);
-static void ExecCheckRTEPerms(RangeTblEntry *rte);
+static bool ExecCheckRTEPerms(RangeTblEntry *rte);
static void ExecCheckXactReadOnly(PlannedStmt *plannedstmt);
static void EvalPlanQualStart(EPQState *epqstate, EState *parentestate,
- Plan *planTree);
+ Plan *planTree);
static void OpenIntoRel(QueryDesc *queryDesc);
static void CloseIntoRel(QueryDesc *queryDesc);
static void intorel_startup(DestReceiver *self, int operation, TupleDesc typeinfo);
* This routine must be called at the beginning of any execution of any
* query plan
*
- * Takes a QueryDesc previously created by CreateQueryDesc (it's not real
- * clear why we bother to separate the two functions, but...). The tupDesc
+ * Takes a QueryDesc previously created by CreateQueryDesc (which is separate
+ * only because some places use QueryDescs for utility commands). The tupDesc
* field of the QueryDesc is filled in to describe the tuples that will be
* returned, and the internal fields (estate and planstate) are set up.
*
switch (queryDesc->operation)
{
case CMD_SELECT:
- /* SELECT INTO and SELECT FOR UPDATE/SHARE need to mark tuples */
+
+ /*
+ * SELECT INTO, SELECT FOR UPDATE/SHARE and modifying CTEs need to
+ * mark tuples
+ */
if (queryDesc->plannedstmt->intoClause != NULL ||
- queryDesc->plannedstmt->rowMarks != NIL)
+ queryDesc->plannedstmt->rowMarks != NIL ||
+ queryDesc->plannedstmt->hasModifyingCTE)
estate->es_output_cid = GetCurrentCommandId(true);
+
+ /*
+ * A SELECT without modifying CTEs can't possibly queue triggers,
+ * so force skip-triggers mode. This is just a marginal efficiency
+ * hack, since AfterTriggerBeginQuery/AfterTriggerEndQuery aren't
+ * all that expensive, but we might as well do it.
+ */
+ if (!queryDesc->plannedstmt->hasModifyingCTE)
+ eflags |= EXEC_FLAG_SKIP_TRIGGERS;
break;
case CMD_INSERT:
*/
estate->es_snapshot = RegisterSnapshot(queryDesc->snapshot);
estate->es_crosscheck_snapshot = RegisterSnapshot(queryDesc->crosscheck_snapshot);
+ estate->es_top_eflags = eflags;
estate->es_instrument = queryDesc->instrument_options;
/*
*/
InitPlan(queryDesc, eflags);
+ /*
+ * Set up an AFTER-trigger statement context, unless told not to, or
+ * unless it's EXPLAIN-only mode (when ExecutorFinish won't be called).
+ */
+ if (!(eflags & (EXEC_FLAG_SKIP_TRIGGERS | EXEC_FLAG_EXPLAIN_ONLY)))
+ AfterTriggerBeginQuery();
+
MemoryContextSwitchTo(oldcontext);
}
estate = queryDesc->estate;
Assert(estate != NULL);
+ Assert(!(estate->es_top_eflags & EXEC_FLAG_EXPLAIN_ONLY));
/*
* Switch into per-query memory context
*/
oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);
- /* Allow instrumentation of ExecutorRun overall runtime */
+ /* Allow instrumentation of Executor overall runtime */
if (queryDesc->totaltime)
InstrStartNode(queryDesc->totaltime);
}
/* ----------------------------------------------------------------
+ * ExecutorFinish
+ *
+ * This routine must be called after the last ExecutorRun call.
+ * It performs cleanup such as firing AFTER triggers. It is
+ * separate from ExecutorEnd because EXPLAIN ANALYZE needs to
+ * include these actions in the total runtime.
+ *
+ * We provide a function hook variable that lets loadable plugins
+ * get control when ExecutorFinish is called. Such a plugin would
+ * normally call standard_ExecutorFinish().
+ *
+ * ----------------------------------------------------------------
+ */
+void
+ExecutorFinish(QueryDesc *queryDesc)
+{
+ if (ExecutorFinish_hook)
+ (*ExecutorFinish_hook) (queryDesc);
+ else
+ standard_ExecutorFinish(queryDesc);
+}
+
+void
+standard_ExecutorFinish(QueryDesc *queryDesc)
+{
+ EState *estate;
+ MemoryContext oldcontext;
+
+ /* sanity checks */
+ Assert(queryDesc != NULL);
+
+ estate = queryDesc->estate;
+
+ Assert(estate != NULL);
+ Assert(!(estate->es_top_eflags & EXEC_FLAG_EXPLAIN_ONLY));
+
+ /* This should be run once and only once per Executor instance */
+ Assert(!estate->es_finished);
+
+ /* Switch into per-query memory context */
+ oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);
+
+ /* Allow instrumentation of Executor overall runtime */
+ if (queryDesc->totaltime)
+ InstrStartNode(queryDesc->totaltime);
+
+ /* Run ModifyTable nodes to completion */
+ ExecPostprocessPlan(estate);
+
+ /* Execute queued AFTER triggers, unless told not to */
+ if (!(estate->es_top_eflags & EXEC_FLAG_SKIP_TRIGGERS))
+ AfterTriggerEndQuery(estate);
+
+ if (queryDesc->totaltime)
+ InstrStopNode(queryDesc->totaltime, 0);
+
+ MemoryContextSwitchTo(oldcontext);
+
+ estate->es_finished = true;
+}
+
+/* ----------------------------------------------------------------
* ExecutorEnd
*
* This routine must be called at the end of execution of any
Assert(estate != NULL);
/*
+ * Check that ExecutorFinish was called, unless in EXPLAIN-only mode. This
+ * Assert is needed because ExecutorFinish is new as of 9.1, and callers
+ * might forget to call it.
+ */
+ Assert(estate->es_finished ||
+ (estate->es_top_eflags & EXEC_FLAG_EXPLAIN_ONLY));
+
+ /*
* Switch into per-query memory context to run ExecEndPlan
*/
oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);
/*
* rescan plan
*/
- ExecReScan(queryDesc->planstate, NULL);
+ ExecReScan(queryDesc->planstate);
MemoryContextSwitchTo(oldcontext);
}
/*
* ExecCheckRTPerms
* Check access permissions for all relations listed in a range table.
+ *
+ * Returns true if permissions are adequate. Otherwise, throws an appropriate
+ * error if ereport_on_violation is true, or simply returns false otherwise.
*/
-static void
-ExecCheckRTPerms(List *rangeTable)
+bool
+ExecCheckRTPerms(List *rangeTable, bool ereport_on_violation)
{
ListCell *l;
+ bool result = true;
foreach(l, rangeTable)
{
- ExecCheckRTEPerms((RangeTblEntry *) lfirst(l));
+ RangeTblEntry *rte = (RangeTblEntry *) lfirst(l);
+
+ result = ExecCheckRTEPerms(rte);
+ if (!result)
+ {
+ Assert(rte->rtekind == RTE_RELATION);
+ if (ereport_on_violation)
+ aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
+ get_rel_name(rte->relid));
+ return false;
+ }
}
+
+ if (ExecutorCheckPerms_hook)
+ result = (*ExecutorCheckPerms_hook) (rangeTable,
+ ereport_on_violation);
+ return result;
}
/*
* ExecCheckRTEPerms
* Check access permissions for a single RTE.
*/
-static void
+static bool
ExecCheckRTEPerms(RangeTblEntry *rte)
{
AclMode requiredPerms;
* Join, subquery, and special RTEs need no checks.
*/
if (rte->rtekind != RTE_RELATION)
- return;
+ return true;
/*
* No work if requiredPerms is empty.
*/
requiredPerms = rte->requiredPerms;
if (requiredPerms == 0)
- return;
+ return true;
relOid = rte->relid;
* we can fail straight away.
*/
if (remainingPerms & ~(ACL_SELECT | ACL_INSERT | ACL_UPDATE))
- aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
- get_rel_name(relOid));
+ return false;
/*
* Check to see if we have the needed privileges at column level.
{
if (pg_attribute_aclcheck_all(relOid, userid, ACL_SELECT,
ACLMASK_ANY) != ACLCHECK_OK)
- aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
- get_rel_name(relOid));
+ return false;
}
tmpset = bms_copy(rte->selectedCols);
/* Whole-row reference, must have priv on all cols */
if (pg_attribute_aclcheck_all(relOid, userid, ACL_SELECT,
ACLMASK_ALL) != ACLCHECK_OK)
- aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
- get_rel_name(relOid));
+ return false;
}
else
{
- if (pg_attribute_aclcheck(relOid, col, userid, ACL_SELECT)
- != ACLCHECK_OK)
- aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
- get_rel_name(relOid));
+ if (pg_attribute_aclcheck(relOid, col, userid,
+ ACL_SELECT) != ACLCHECK_OK)
+ return false;
}
}
bms_free(tmpset);
{
if (pg_attribute_aclcheck_all(relOid, userid, remainingPerms,
ACLMASK_ANY) != ACLCHECK_OK)
- aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
- get_rel_name(relOid));
+ return false;
}
tmpset = bms_copy(rte->modifiedCols);
}
else
{
- if (pg_attribute_aclcheck(relOid, col, userid, remainingPerms)
- != ACLCHECK_OK)
- aclcheck_error(ACLCHECK_NO_PRIV, ACL_KIND_CLASS,
- get_rel_name(relOid));
+ if (pg_attribute_aclcheck(relOid, col, userid,
+ remainingPerms) != ACLCHECK_OK)
+ return false;
}
}
bms_free(tmpset);
}
}
+ return true;
}
/*
* Check that the query does not imply any writes to non-temp tables.
+ *
+ * Note: in a Hot Standby slave this would need to reject writes to temp
+ * tables as well; but an HS slave can't have created any temp tables
+ * in the first place, so no need to check that.
*/
static void
ExecCheckXactReadOnly(PlannedStmt *plannedstmt)
/*
* CREATE TABLE AS or SELECT INTO?
*
- * XXX should we allow this if the destination is temp?
+ * XXX should we allow this if the destination is temp? Considering that
+ * it would still require catalog changes, probably not.
*/
if (plannedstmt->intoClause != NULL)
- goto fail;
+ PreventCommandIfReadOnly(CreateCommandTag((Node *) plannedstmt));
/* Fail if write permissions are requested on any non-temp table */
foreach(l, plannedstmt->rtable)
if (isTempNamespace(get_rel_namespace(rte->relid)))
continue;
- goto fail;
+ PreventCommandIfReadOnly(CreateCommandTag((Node *) plannedstmt));
}
-
- return;
-
-fail:
- ereport(ERROR,
- (errcode(ERRCODE_READ_ONLY_SQL_TRANSACTION),
- errmsg("transaction is read-only")));
}
/*
* Do permissions checks
*/
- ExecCheckRTPerms(rangeTable);
+ ExecCheckRTPerms(rangeTable, true);
/*
* initialize the node's execution state
/*
* initialize result relation stuff, and open/lock the result rels.
*
- * We must do this before initializing the plan tree, else we might
- * try to do a lock upgrade if a result rel is also a source rel.
+ * We must do this before initializing the plan tree, else we might try to
+ * do a lock upgrade if a result rel is also a source rel.
*/
if (plannedstmt->resultRelations)
{
InitResultRelInfo(resultRelInfo,
resultRelation,
resultRelationIndex,
- operation,
estate->es_instrument);
resultRelInfo++;
}
/*
* Similarly, we have to lock relations selected FOR UPDATE/FOR SHARE
- * before we initialize the plan tree, else we'd be risking lock
- * upgrades. While we are at it, build the ExecRowMark list.
+ * before we initialize the plan tree, else we'd be risking lock upgrades.
+ * While we are at it, build the ExecRowMark list.
*/
estate->es_rowMarks = NIL;
foreach(l, plannedstmt->rowMarks)
break;
}
+ /* Check that relation is a legal target for marking */
+ if (relation)
+ CheckValidRowMarkRel(relation, rc->markType);
+
erm = (ExecRowMark *) palloc(sizeof(ExecRowMark));
erm->relation = relation;
erm->rti = rc->rti;
erm->prti = rc->prti;
+ erm->rowmarkId = rc->rowmarkId;
erm->markType = rc->markType;
erm->noWait = rc->noWait;
- erm->ctidAttNo = rc->ctidAttNo;
- erm->toidAttNo = rc->toidAttNo;
- erm->wholeAttNo = rc->wholeAttNo;
ItemPointerSetInvalid(&(erm->curCtid));
estate->es_rowMarks = lappend(estate->es_rowMarks, erm);
}
tupType = ExecGetResultType(planstate);
/*
- * Initialize the junk filter if needed. SELECT queries need a
- * filter if there are any junk attrs in the top-level tlist.
+ * Initialize the junk filter if needed. SELECT queries need a filter if
+ * there are any junk attrs in the top-level tlist.
*/
if (operation == CMD_SELECT)
{
}
/*
- * Initialize ResultRelInfo data for one result relation
+ * Check that a proposed result relation is a legal target for the operation
+ *
+ * In most cases parser and/or planner should have noticed this already, but
+ * let's make sure. In the view case we do need a test here, because if the
+ * view wasn't rewritten by a rule, it had better have an INSTEAD trigger.
+ *
+ * Note: when changing this function, you probably also need to look at
+ * CheckValidRowMarkRel.
*/
void
-InitResultRelInfo(ResultRelInfo *resultRelInfo,
- Relation resultRelationDesc,
- Index resultRelationIndex,
- CmdType operation,
- int instrument_options)
+CheckValidResultRel(Relation resultRel, CmdType operation)
{
- /*
- * Check valid relkind ... parser and/or planner should have noticed this
- * already, but let's make sure.
- */
- switch (resultRelationDesc->rd_rel->relkind)
+ TriggerDesc *trigDesc = resultRel->trigdesc;
+
+ switch (resultRel->rd_rel->relkind)
{
case RELKIND_RELATION:
/* OK */
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot change sequence \"%s\"",
- RelationGetRelationName(resultRelationDesc))));
+ RelationGetRelationName(resultRel))));
break;
case RELKIND_TOASTVALUE:
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot change TOAST relation \"%s\"",
- RelationGetRelationName(resultRelationDesc))));
+ RelationGetRelationName(resultRel))));
break;
case RELKIND_VIEW:
+ switch (operation)
+ {
+ case CMD_INSERT:
+ if (!trigDesc || !trigDesc->trig_insert_instead_row)
+ ereport(ERROR,
+ (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
+ errmsg("cannot insert into view \"%s\"",
+ RelationGetRelationName(resultRel)),
+ errhint("You need an unconditional ON INSERT DO INSTEAD rule or an INSTEAD OF INSERT trigger.")));
+ break;
+ case CMD_UPDATE:
+ if (!trigDesc || !trigDesc->trig_update_instead_row)
+ ereport(ERROR,
+ (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
+ errmsg("cannot update view \"%s\"",
+ RelationGetRelationName(resultRel)),
+ errhint("You need an unconditional ON UPDATE DO INSTEAD rule or an INSTEAD OF UPDATE trigger.")));
+ break;
+ case CMD_DELETE:
+ if (!trigDesc || !trigDesc->trig_delete_instead_row)
+ ereport(ERROR,
+ (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
+ errmsg("cannot delete from view \"%s\"",
+ RelationGetRelationName(resultRel)),
+ errhint("You need an unconditional ON DELETE DO INSTEAD rule or an INSTEAD OF DELETE trigger.")));
+ break;
+ default:
+ elog(ERROR, "unrecognized CmdType: %d", (int) operation);
+ break;
+ }
+ break;
+ case RELKIND_FOREIGN_TABLE:
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
- errmsg("cannot change view \"%s\"",
- RelationGetRelationName(resultRelationDesc))));
+ errmsg("cannot change foreign table \"%s\"",
+ RelationGetRelationName(resultRel))));
break;
default:
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot change relation \"%s\"",
- RelationGetRelationName(resultRelationDesc))));
+ RelationGetRelationName(resultRel))));
+ break;
+ }
+}
+
+/*
+ * Check that a proposed rowmark target relation is a legal target
+ *
+ * In most cases parser and/or planner should have noticed this already, but
+ * they don't cover all cases.
+ */
+static void
+CheckValidRowMarkRel(Relation rel, RowMarkType markType)
+{
+ switch (rel->rd_rel->relkind)
+ {
+ case RELKIND_RELATION:
+ /* OK */
+ break;
+ case RELKIND_SEQUENCE:
+ /* Must disallow this because we don't vacuum sequences */
+ ereport(ERROR,
+ (errcode(ERRCODE_WRONG_OBJECT_TYPE),
+ errmsg("cannot lock rows in sequence \"%s\"",
+ RelationGetRelationName(rel))));
+ break;
+ case RELKIND_TOASTVALUE:
+ /* We could allow this, but there seems no good reason to */
+ ereport(ERROR,
+ (errcode(ERRCODE_WRONG_OBJECT_TYPE),
+ errmsg("cannot lock rows in TOAST relation \"%s\"",
+ RelationGetRelationName(rel))));
+ break;
+ case RELKIND_VIEW:
+ /* Should not get here */
+ ereport(ERROR,
+ (errcode(ERRCODE_WRONG_OBJECT_TYPE),
+ errmsg("cannot lock rows in view \"%s\"",
+ RelationGetRelationName(rel))));
+ break;
+ case RELKIND_FOREIGN_TABLE:
+ /* Perhaps we can support this someday, but not today */
+ ereport(ERROR,
+ (errcode(ERRCODE_WRONG_OBJECT_TYPE),
+ errmsg("cannot lock rows in foreign table \"%s\"",
+ RelationGetRelationName(rel))));
+ break;
+ default:
+ ereport(ERROR,
+ (errcode(ERRCODE_WRONG_OBJECT_TYPE),
+ errmsg("cannot lock rows in relation \"%s\"",
+ RelationGetRelationName(rel))));
break;
}
+}
- /* OK, fill in the node */
+/*
+ * Initialize ResultRelInfo data for one result relation
+ *
+ * Caution: before Postgres 9.1, this function included the relkind checking
+ * that's now in CheckValidResultRel, and it also did ExecOpenIndices if
+ * appropriate. Be sure callers cover those needs.
+ */
+void
+InitResultRelInfo(ResultRelInfo *resultRelInfo,
+ Relation resultRelationDesc,
+ Index resultRelationIndex,
+ int instrument_options)
+{
MemSet(resultRelInfo, 0, sizeof(ResultRelInfo));
resultRelInfo->type = T_ResultRelInfo;
resultRelInfo->ri_RangeTableIndex = resultRelationIndex;
resultRelInfo->ri_ConstraintExprs = NULL;
resultRelInfo->ri_junkFilter = NULL;
resultRelInfo->ri_projectReturning = NULL;
-
- /*
- * If there are indices on the result relation, open them and save
- * descriptors in the result relation info, so that we can add new index
- * entries for the tuples we add/update. We need not do this for a
- * DELETE, however, since deletion doesn't affect indexes.
- */
- if (resultRelationDesc->rd_rel->relhasindex &&
- operation != CMD_DELETE)
- ExecOpenIndices(resultRelInfo);
}
/*
/*
* Open the target relation's relcache entry. We assume that an
* appropriate lock is still held by the backend from whenever the trigger
- * event got queued, so we need take no new lock here.
+ * event got queued, so we need take no new lock here. Also, we need not
+ * recheck the relkind, so no need for CheckValidResultRel.
*/
rel = heap_open(relid, NoLock);
/*
- * Make the new entry in the right context. Currently, we don't need any
- * index information in ResultRelInfos used only for triggers, so tell
- * InitResultRelInfo it's a DELETE.
+ * Make the new entry in the right context.
*/
oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);
rInfo = makeNode(ResultRelInfo);
InitResultRelInfo(rInfo,
rel,
0, /* dummy rangetable index */
- CMD_DELETE,
estate->es_instrument);
estate->es_trig_target_relations =
lappend(estate->es_trig_target_relations, rInfo);
MemoryContextSwitchTo(oldcontext);
+ /*
+ * Currently, we don't need any index information in ResultRelInfos used
+ * only for triggers, so no need to call ExecOpenIndices.
+ */
+
return rInfo;
}
}
/* ----------------------------------------------------------------
+ * ExecPostprocessPlan
+ *
+ * Give plan nodes a final chance to execute before shutdown
+ * ----------------------------------------------------------------
+ */
+static void
+ExecPostprocessPlan(EState *estate)
+{
+ ListCell *lc;
+
+ /*
+ * Make sure nodes run forward.
+ */
+ estate->es_direction = ForwardScanDirection;
+
+ /*
+ * Run any secondary ModifyTable nodes to completion, in case the main
+ * query did not fetch all rows from them. (We do this to ensure that
+ * such nodes have predictable results.)
+ */
+ foreach(lc, estate->es_auxmodifytables)
+ {
+ PlanState *ps = (PlanState *) lfirst(lc);
+
+ for (;;)
+ {
+ TupleTableSlot *slot;
+
+ /* Reset the per-output-tuple exprcontext each time */
+ ResetPerTupleExprContext(estate);
+
+ slot = ExecProcNode(ps);
+
+ if (TupIsNull(slot))
+ break;
+ }
+ }
+}
+
+/* ----------------------------------------------------------------
* ExecEndPlan
*
* Cleans up the query plan -- closes files and frees up storage
/*
* destroy the executor's tuple table. Actually we only care about
- * releasing buffer pins and tupdesc refcounts; there's no need to
- * pfree the TupleTableSlots, since the containing memory context
- * is about to go away anyway.
+ * releasing buffer pins and tupdesc refcounts; there's no need to pfree
+ * the TupleTableSlots, since the containing memory context is about to go
+ * away anyway.
*/
ExecResetTupleTable(estate->es_tupleTable, false);
slot = ExecFilterJunk(estate->es_junkFilter, slot);
/*
- * If we are supposed to send the tuple somewhere, do so.
- * (In practice, this is probably always the case at this point.)
+ * If we are supposed to send the tuple somewhere, do so. (In
+ * practice, this is probably always the case at this point.)
*/
if (sendTuples)
(*dest->receiveSlot) (slot, dest);
/*
+ * ExecFindRowMark -- find the ExecRowMark struct for given rangetable index
+ */
+ExecRowMark *
+ExecFindRowMark(EState *estate, Index rti)
+{
+ ListCell *lc;
+
+ foreach(lc, estate->es_rowMarks)
+ {
+ ExecRowMark *erm = (ExecRowMark *) lfirst(lc);
+
+ if (erm->rti == rti)
+ return erm;
+ }
+ elog(ERROR, "failed to find ExecRowMark for rangetable index %u", rti);
+ return NULL; /* keep compiler quiet */
+}
+
+/*
+ * ExecBuildAuxRowMark -- create an ExecAuxRowMark struct
+ *
+ * Inputs are the underlying ExecRowMark struct and the targetlist of the
+ * input plan node (not planstate node!). We need the latter to find out
+ * the column numbers of the resjunk columns.
+ */
+ExecAuxRowMark *
+ExecBuildAuxRowMark(ExecRowMark *erm, List *targetlist)
+{
+ ExecAuxRowMark *aerm = (ExecAuxRowMark *) palloc0(sizeof(ExecAuxRowMark));
+ char resname[32];
+
+ aerm->rowmark = erm;
+
+ /* Look up the resjunk columns associated with this rowmark */
+ if (erm->relation)
+ {
+ Assert(erm->markType != ROW_MARK_COPY);
+
+ /* if child rel, need tableoid */
+ if (erm->rti != erm->prti)
+ {
+ snprintf(resname, sizeof(resname), "tableoid%u", erm->rowmarkId);
+ aerm->toidAttNo = ExecFindJunkAttributeInTlist(targetlist,
+ resname);
+ if (!AttributeNumberIsValid(aerm->toidAttNo))
+ elog(ERROR, "could not find junk %s column", resname);
+ }
+
+ /* always need ctid for real relations */
+ snprintf(resname, sizeof(resname), "ctid%u", erm->rowmarkId);
+ aerm->ctidAttNo = ExecFindJunkAttributeInTlist(targetlist,
+ resname);
+ if (!AttributeNumberIsValid(aerm->ctidAttNo))
+ elog(ERROR, "could not find junk %s column", resname);
+ }
+ else
+ {
+ Assert(erm->markType == ROW_MARK_COPY);
+
+ snprintf(resname, sizeof(resname), "wholerow%u", erm->rowmarkId);
+ aerm->wholeAttNo = ExecFindJunkAttributeInTlist(targetlist,
+ resname);
+ if (!AttributeNumberIsValid(aerm->wholeAttNo))
+ elog(ERROR, "could not find junk %s column", resname);
+ }
+
+ return aerm;
+}
+
+
+/*
* EvalPlanQual logic --- recheck modified tuple(s) to see if we want to
* process the updated version under READ COMMITTED rules.
*
EvalPlanQualBegin(epqstate, estate);
/*
- * Free old test tuple, if any, and store new tuple where relation's
- * scan node will see it
+ * Free old test tuple, if any, and store new tuple where relation's scan
+ * node will see it
*/
EvalPlanQualSetTuple(epqstate, rti, copyTuple);
slot = EvalPlanQualNext(epqstate);
/*
- * If we got a tuple, force the slot to materialize the tuple so that
- * it is not dependent on any local state in the EPQ query (in particular,
+ * If we got a tuple, force the slot to materialize the tuple so that it
+ * is not dependent on any local state in the EPQ query (in particular,
* it's highly likely that the slot contains references to any pass-by-ref
- * datums that may be present in copyTuple). As with the next step,
- * this is to guard against early re-use of the EPQ query.
+ * datums that may be present in copyTuple). As with the next step, this
+ * is to guard against early re-use of the EPQ query.
*/
if (!TupIsNull(slot))
(void) ExecMaterializeSlot(slot);
/*
- * Clear out the test tuple. This is needed in case the EPQ query
- * is re-used to test a tuple for a different relation. (Not clear
- * that can really happen, but let's be safe.)
+ * Clear out the test tuple. This is needed in case the EPQ query is
+ * re-used to test a tuple for a different relation. (Not clear that can
+ * really happen, but let's be safe.)
*/
EvalPlanQualSetTuple(epqstate, rti, NULL);
case HeapTupleUpdated:
ReleaseBuffer(buffer);
- if (IsXactIsoLevelSerializable)
+ if (IsolationUsesXactSnapshot())
ereport(ERROR,
(errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
errmsg("could not serialize access due to concurrent update")));
{
/* it was updated, so look at the updated version */
tuple.t_self = update_ctid;
+ /* updated row should have xmin matching this xmax */
+ priorXmax = update_xmax;
continue;
}
/* tuple was deleted, so give up */
/*
* EvalPlanQualInit -- initialize during creation of a plan state node
* that might need to invoke EPQ processing.
- * Note: subplan can be NULL if it will be set later with EvalPlanQualSetPlan.
+ *
+ * Note: subplan/auxrowmarks can be NULL/NIL if they will be set later
+ * with EvalPlanQualSetPlan.
*/
void
EvalPlanQualInit(EPQState *epqstate, EState *estate,
- Plan *subplan, int epqParam)
+ Plan *subplan, List *auxrowmarks, int epqParam)
{
/* Mark the EPQ state inactive */
epqstate->estate = NULL;
epqstate->origslot = NULL;
/* ... and remember data that EvalPlanQualBegin will need */
epqstate->plan = subplan;
- epqstate->rowMarks = NIL;
+ epqstate->arowMarks = auxrowmarks;
epqstate->epqParam = epqParam;
}
* We need this so that ModifyTuple can deal with multiple subplans.
*/
void
-EvalPlanQualSetPlan(EPQState *epqstate, Plan *subplan)
+EvalPlanQualSetPlan(EPQState *epqstate, Plan *subplan, List *auxrowmarks)
{
/* If we have a live EPQ query, shut it down */
EvalPlanQualEnd(epqstate);
/* And set/change the plan pointer */
epqstate->plan = subplan;
-}
-
-/*
- * EvalPlanQualAddRowMark -- add an ExecRowMark that EPQ needs to handle.
- *
- * Currently, only non-locking RowMarks are supported.
- */
-void
-EvalPlanQualAddRowMark(EPQState *epqstate, ExecRowMark *erm)
-{
- if (RowMarkRequiresRowShareLock(erm->markType))
- elog(ERROR, "EvalPlanQual doesn't support locking rowmarks");
- epqstate->rowMarks = lappend(epqstate->rowMarks, erm);
+ /* The rowmarks depend on the plan, too */
+ epqstate->arowMarks = auxrowmarks;
}
/*
Assert(rti > 0);
/*
- * free old test tuple, if any, and store new tuple where relation's
- * scan node will see it
+ * free old test tuple, if any, and store new tuple where relation's scan
+ * node will see it
*/
if (estate->es_epqTuple[rti - 1] != NULL)
heap_freetuple(estate->es_epqTuple[rti - 1]);
/*
* Fetch the current row values for any non-locked relations that need
- * to be scanned by an EvalPlanQual operation. origslot must have been set
+ * to be scanned by an EvalPlanQual operation. origslot must have been set
* to contain the current result row (top-level row) that we need to recheck.
*/
void
Assert(epqstate->origslot != NULL);
- foreach(l, epqstate->rowMarks)
+ foreach(l, epqstate->arowMarks)
{
- ExecRowMark *erm = (ExecRowMark *) lfirst(l);
+ ExecAuxRowMark *aerm = (ExecAuxRowMark *) lfirst(l);
+ ExecRowMark *erm = aerm->rowmark;
Datum datum;
bool isNull;
HeapTupleData tuple;
+ if (RowMarkRequiresRowShareLock(erm->markType))
+ elog(ERROR, "EvalPlanQual doesn't support locking rowmarks");
+
/* clear any leftover test tuple for this rel */
EvalPlanQualSetTuple(epqstate, erm->rti, NULL);
Oid tableoid;
datum = ExecGetJunkAttribute(epqstate->origslot,
- erm->toidAttNo,
+ aerm->toidAttNo,
&isNull);
/* non-locked rels could be on the inside of outer joins */
if (isNull)
/* fetch the tuple's ctid */
datum = ExecGetJunkAttribute(epqstate->origslot,
- erm->ctidAttNo,
+ aerm->ctidAttNo,
&isNull);
/* non-locked rels could be on the inside of outer joins */
if (isNull)
/* fetch the whole-row Var for the relation */
datum = ExecGetJunkAttribute(epqstate->origslot,
- erm->wholeAttNo,
+ aerm->wholeAttNo,
&isNull);
/* non-locked rels could be on the inside of outer joins */
if (isNull)
/* Recopy current values of parent parameters */
if (parentestate->es_plannedstmt->nParamExec > 0)
{
- int i = parentestate->es_plannedstmt->nParamExec;
+ int i = parentestate->es_plannedstmt->nParamExec;
while (--i >= 0)
{
estate->es_result_relation_info = parentestate->es_result_relation_info;
/* es_trig_target_relations must NOT be copied */
estate->es_rowMarks = parentestate->es_rowMarks;
+ estate->es_top_eflags = parentestate->es_top_eflags;
estate->es_instrument = parentestate->es_instrument;
estate->es_select_into = parentestate->es_select_into;
estate->es_into_oids = parentestate->es_into_oids;
+ /* es_auxmodifytables must NOT be copied */
/*
* The external param list is simply shared from parent. The internal
estate->es_param_list_info = parentestate->es_param_list_info;
if (parentestate->es_plannedstmt->nParamExec > 0)
{
- int i = parentestate->es_plannedstmt->nParamExec;
+ int i = parentestate->es_plannedstmt->nParamExec;
estate->es_param_exec_vals = (ParamExecData *)
palloc0(i * sizeof(ParamExecData));
/*
* Each EState must have its own es_epqScanDone state, but if we have
- * nested EPQ checks they should share es_epqTuple arrays. This allows
+ * nested EPQ checks they should share es_epqTuple arrays. This allows
* sub-rechecks to inherit the values being examined by an outer recheck.
*/
estate->es_epqScanDone = (bool *) palloc0(rtsize * sizeof(bool));
/*
* Initialize private state information for each SubPlan. We must do this
* before running ExecInitNode on the main query tree, since
- * ExecInitSubPlan expects to be able to find these entries.
- * Some of the SubPlans might not be used in the part of the plan tree
- * we intend to run, but since it's not easy to tell which, we just
- * initialize them all.
+ * ExecInitSubPlan expects to be able to find these entries. Some of the
+ * SubPlans might not be used in the part of the plan tree we intend to
+ * run, but since it's not easy to tell which, we just initialize them
+ * all. (However, if the subplan is headed by a ModifyTable node, then it
+ * must be a data-modifying CTE, which we will certainly not need to
+ * re-run, so we can skip initializing it. This is just an efficiency
+ * hack; it won't skip data-modifying CTEs for which the ModifyTable node
+ * is not at the top.)
*/
Assert(estate->es_subplanstates == NIL);
foreach(l, parentestate->es_plannedstmt->subplans)
Plan *subplan = (Plan *) lfirst(l);
PlanState *subplanstate;
- subplanstate = ExecInitNode(subplan, estate, 0);
+ /* Don't initialize ModifyTable subplans, per comment above */
+ if (IsA(subplan, ModifyTable))
+ subplanstate = NULL;
+ else
+ subplanstate = ExecInitNode(subplan, estate, 0);
estate->es_subplanstates = lappend(estate->es_subplanstates,
subplanstate);
}
/*
- * Initialize the private state information for all the nodes in the
- * part of the plan tree we need to run. This opens files, allocates
- * storage and leaves us ready to start processing tuples.
+ * Initialize the private state information for all the nodes in the part
+ * of the plan tree we need to run. This opens files, allocates storage
+ * and leaves us ready to start processing tuples.
*/
epqstate->planstate = ExecInitNode(planTree, estate, 0);
Oid namespaceId;
Oid tablespaceId;
Datum reloptions;
- AclResult aclresult;
Oid intoRelationId;
- TupleDesc tupdesc;
DR_intorel *myState;
static char *validnsps[] = HEAP_RELOPT_NAMESPACES;
Assert(into);
/*
- * XXX This code needs to be kept in sync with DefineRelation().
- * Maybe we should try to use that function instead.
+ * XXX This code needs to be kept in sync with DefineRelation(). Maybe we
+ * should try to use that function instead.
*/
/*
* Check consistency of arguments
*/
- if (into->onCommit != ONCOMMIT_NOOP && !into->rel->istemp)
+ if (into->onCommit != ONCOMMIT_NOOP
+ && into->rel->relpersistence != RELPERSISTENCE_TEMP)
ereport(ERROR,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("ON COMMIT can only be used on temporary tables")));
/*
+ * Find namespace to create in, check its permissions
+ */
+ intoName = into->rel->relname;
+ namespaceId = RangeVarGetAndCheckCreationNamespace(into->rel);
+ RangeVarAdjustRelationPersistence(into->rel, namespaceId);
+
+ /*
* Security check: disallow creating temp tables from security-restricted
* code. This is needed because calling code might not expect untrusted
* tables to appear in pg_temp at the front of its search path.
*/
- if (into->rel->istemp && InSecurityRestrictedOperation())
+ if (into->rel->relpersistence == RELPERSISTENCE_TEMP
+ && InSecurityRestrictedOperation())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("cannot create temporary table within security-restricted operation")));
/*
- * Find namespace to create in, check its permissions
- */
- intoName = into->rel->relname;
- namespaceId = RangeVarGetCreationNamespace(into->rel);
-
- aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(),
- ACL_CREATE);
- if (aclresult != ACLCHECK_OK)
- aclcheck_error(aclresult, ACL_KIND_NAMESPACE,
- get_namespace_name(namespaceId));
-
- /*
* Select tablespace to use. If not specified, use default tablespace
* (which may in turn default to database's default).
*/
if (into->tableSpaceName)
{
- tablespaceId = get_tablespace_oid(into->tableSpaceName);
- if (!OidIsValid(tablespaceId))
- ereport(ERROR,
- (errcode(ERRCODE_UNDEFINED_OBJECT),
- errmsg("tablespace \"%s\" does not exist",
- into->tableSpaceName)));
+ tablespaceId = get_tablespace_oid(into->tableSpaceName, false);
}
else
{
- tablespaceId = GetDefaultTablespace(into->rel->istemp);
+ tablespaceId = GetDefaultTablespace(into->rel->relpersistence);
/* note InvalidOid is OK in this case */
}
false);
(void) heap_reloptions(RELKIND_RELATION, reloptions, true);
- /* Copy the tupdesc because heap_create_with_catalog modifies it */
- tupdesc = CreateTupleDescCopy(queryDesc->tupDesc);
-
/* Now we can actually create the new relation */
intoRelationId = heap_create_with_catalog(intoName,
namespaceId,
tablespaceId,
InvalidOid,
InvalidOid,
+ InvalidOid,
GetUserId(),
- tupdesc,
+ queryDesc->tupDesc,
NIL,
RELKIND_RELATION,
+ into->rel->relpersistence,
+ false,
false,
true,
0,
reloptions,
true,
allowSystemTableMods);
-
- FreeTupleDesc(tupdesc);
+ Assert(intoRelationId != InvalidOid);
/*
* Advance command counter so that the newly-created relation's catalog
(void) heap_reloptions(RELKIND_TOASTVALUE, reloptions, true);
- AlterTableCreateToastTable(intoRelationId, InvalidOid, reloptions, false);
+ AlterTableCreateToastTable(intoRelationId, reloptions);
/*
* And open the constructed table for writing.
myState->rel = intoRelationDesc;
/*
- * We can skip WAL-logging the insertions, unless PITR is in use. We can
- * skip the FSM in any case.
+ * We can skip WAL-logging the insertions, unless PITR or streaming
+ * replication is in use. We can skip the FSM in any case.
*/
myState->hi_options = HEAP_INSERT_SKIP_FSM |
- (XLogArchivingActive() ? 0 : HEAP_INSERT_SKIP_WAL);
+ (XLogIsNeeded() ? 0 : HEAP_INSERT_SKIP_WAL);
myState->bistate = GetBulkInsertState();
- /* Not using WAL requires rd_targblock be initially invalid */
- Assert(intoRelationDesc->rd_targblock == InvalidBlockNumber);
+ /* Not using WAL requires smgr_targblock be initially invalid */
+ Assert(RelationGetTargetBlock(intoRelationDesc) == InvalidBlockNumber);
}
/*
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