/*
* DISCARD { ALL | SEQUENCES | TEMP | PLANS }
*/
void
DiscardCommand(DiscardStmt *stmt, bool isTopLevel)
{
switch (stmt->target)
{
case DISCARD_ALL:
DiscardAll(isTopLevel);
break;
case DISCARD_PLANS:
ResetPlanCache();
break;
case DISCARD_SEQUENCES:
ResetSequenceCaches();
break;
case DISCARD_TEMP:
ResetTempTableNamespace();
break;
default:
elog(ERROR, "unrecognized DISCARD target: %d", stmt->target);
}
}
static void
DiscardAll(bool isTopLevel)
{
/*
* Disallow DISCARD ALL in a transaction block. This is arguably
* inconsistent (we don't make a similar check in the command sequence
* that DISCARD ALL is equivalent to), but the idea is to catch mistakes:
* DISCARD ALL inside a transaction block would leave the transaction
* still uncommitted.
*/
PreventTransactionChain(isTopLevel, "DISCARD ALL");
SetPGVariable("session_authorization", NIL, false);
ResetAllOptions();
DropAllPreparedStatements();
PortalHashTableDeleteAll();
Async_UnlistenAll();
LockReleaseAll(USER_LOCKMETHOD, true);
ResetPlanCache();
ResetTempTableNamespace();
}
