/*
* Executor state preparation for evaluation of constraint expressions,
* indexes and triggers.
*
* This is based on similar code in copy.c
*/
static EState *
create_estate_for_relation(LogicalRepRelMapEntry *rel)
{
EState *estate;
ResultRelInfo *resultRelInfo;
RangeTblEntry *rte;
estate = CreateExecutorState();
rte = makeNode(RangeTblEntry);
rte->rtekind = RTE_RELATION;
rte->relid = RelationGetRelid(rel->localrel);
rte->relkind = rel->localrel->rd_rel->relkind;
estate->es_range_table = list_make1(rte);
resultRelInfo = makeNode(ResultRelInfo);
InitResultRelInfo(resultRelInfo, rel->localrel, 1, NULL, 0);
estate->es_result_relations = resultRelInfo;
estate->es_num_result_relations = 1;
estate->es_result_relation_info = resultRelInfo;
estate->es_output_cid = GetCurrentCommandId(true);
/* Triggers might need a slot */
if (resultRelInfo->ri_TrigDesc)
estate->es_trig_tuple_slot = ExecInitExtraTupleSlot(estate, NULL);
/* Prepare to catch AFTER triggers. */
AfterTriggerBeginQuery();
return estate;
}
/*
* ProcessQuery
* Execute a single plannable query within a PORTAL_MULTI_QUERY
* or PORTAL_ONE_RETURNING portal
*
* parsetree: the query tree
* plan: the plan tree for the query
* params: any parameters needed
* dest: where to send results
* completionTag: points to a buffer of size COMPLETION_TAG_BUFSIZE
* in which to store a command completion status string.
*
* completionTag may be NULL if caller doesn't want a status string.
*
* Must be called in a memory context that will be reset or deleted on
* error; otherwise the executor's memory usage will be leaked.
*/
static void
ProcessQuery(Query *parsetree,
Plan *plan,
ParamListInfo params,
DestReceiver *dest,
char *completionTag)
{
int operation = parsetree->commandType;
QueryDesc *queryDesc;
ereport(DEBUG3,
(errmsg_internal("ProcessQuery")));
/*
* Must always set snapshot for plannable queries. Note we assume that
* caller will take care of restoring ActiveSnapshot on exit/error.
*/
ActiveSnapshot = CopySnapshot(GetTransactionSnapshot());
/*
* Create the QueryDesc object
*/
queryDesc = CreateQueryDesc(parsetree, plan,
ActiveSnapshot, InvalidSnapshot,
dest, params, false);
/*
* Set up to collect AFTER triggers
*/
AfterTriggerBeginQuery();
/*
* Call ExecutorStart to prepare the plan for execution
*/
ExecutorStart(queryDesc, 0);
/*
* Run the plan to completion.
*/
ExecutorRun(queryDesc, ForwardScanDirection, 0L);
/*
* Build command completion status string, if caller wants one.
*/
if (completionTag)
{
Oid lastOid;
switch (operation)
{
case CMD_SELECT:
strcpy(completionTag, "SELECT");
break;
case CMD_INSERT:
if (queryDesc->estate->es_processed == 1)
lastOid = queryDesc->estate->es_lastoid;
else
lastOid = InvalidOid;
snprintf(completionTag, COMPLETION_TAG_BUFSIZE,
"INSERT %u %u", lastOid, queryDesc->estate->es_processed);
break;
case CMD_UPDATE:
snprintf(completionTag, COMPLETION_TAG_BUFSIZE,
"UPDATE %u", queryDesc->estate->es_processed);
break;
case CMD_DELETE:
snprintf(completionTag, COMPLETION_TAG_BUFSIZE,
"DELETE %u", queryDesc->estate->es_processed);
break;
default:
strcpy(completionTag, "???");
break;
}
}
/* Now take care of any queued AFTER triggers */
AfterTriggerEndQuery(queryDesc->estate);
/*
* Now, we close down all the scans and free allocated resources.
*/
ExecutorEnd(queryDesc);
FreeQueryDesc(queryDesc);
FreeSnapshot(ActiveSnapshot);
ActiveSnapshot = NULL;
}
/*
* ProcessQuery
* Execute a single plannable query within a PORTAL_MULTI_QUERY
* or PORTAL_ONE_RETURNING portal
*
* plan: the plan tree for the query
* sourceText: the source text of the query
* params: any parameters needed
* dest: where to send results
* completionTag: points to a buffer of size COMPLETION_TAG_BUFSIZE
* in which to store a command completion status string.
*
* completionTag may be NULL if caller doesn't want a status string.
*
* Must be called in a memory context that will be reset or deleted on
* error; otherwise the executor's memory usage will be leaked.
*/
static void
ProcessQuery(PlannedStmt *plan,
const char *sourceText,
ParamListInfo params,
DestReceiver *dest,
char *completionTag)
{
QueryDesc *queryDesc;
elog(DEBUG3, "ProcessQuery");
/*
* Must always set a snapshot for plannable queries.
*/
PushActiveSnapshot(GetTransactionSnapshot());
/*
* Create the QueryDesc object
*/
queryDesc = CreateQueryDesc(plan, sourceText,
GetActiveSnapshot(), InvalidSnapshot,
dest, params, 0);
/*
* Set up to collect AFTER triggers
*/
AfterTriggerBeginQuery();
/*
* Call ExecutorStart to prepare the plan for execution
*/
ExecutorStart(queryDesc, 0);
/*
* Run the plan to completion.
*/
ExecutorRun(queryDesc, ForwardScanDirection, 0L);
/*
* Build command completion status string, if caller wants one.
*/
if (completionTag)
{
Oid lastOid;
switch (queryDesc->operation)
{
case CMD_SELECT:
snprintf(completionTag, COMPLETION_TAG_BUFSIZE,
"SELECT %u", queryDesc->estate->es_processed);
break;
case CMD_INSERT:
if (queryDesc->estate->es_processed == 1)
lastOid = queryDesc->estate->es_lastoid;
else
lastOid = InvalidOid;
snprintf(completionTag, COMPLETION_TAG_BUFSIZE,
"INSERT %u %u", lastOid, queryDesc->estate->es_processed);
break;
case CMD_UPDATE:
snprintf(completionTag, COMPLETION_TAG_BUFSIZE,
"UPDATE %u", queryDesc->estate->es_processed);
break;
case CMD_DELETE:
snprintf(completionTag, COMPLETION_TAG_BUFSIZE,
"DELETE %u", queryDesc->estate->es_processed);
break;
default:
strcpy(completionTag, "???");
break;
}
}
/* Now take care of any queued AFTER triggers */
AfterTriggerEndQuery(queryDesc->estate);
PopActiveSnapshot();
/*
* Now, we close down all the scans and free allocated resources.
*/
ExecutorEnd(queryDesc);
FreeQueryDesc(queryDesc);
}
