Function EvalPlanQualInit

src/backend/executor/execMain.c:3675–3706

* EvalPlanQualInit -- initialize during creation of a plan state node * that might need to invoke EPQ processing. * * Note: subplan/auxrowmarks can be NULL/NIL if they will be set later * with EvalPlanQualSetPlan. */

 * with EvalPlanQualSetPlan.
 */
void
EvalPlanQualInit(EPQState *epqstate, EState *parentestate,
				 Plan *subplan, List *auxrowmarks, int epqParam)
{
	Index		rtsize = parentestate->es_range_table_size;

	/* initialize data not changing over EPQState's lifetime */
	epqstate->parentestate = parentestate;
	epqstate->epqParam = epqParam;

	/*
	 * Allocate space to reference a slot for each potential rti - do so now
	 * rather than in EvalPlanQualBegin(), as done for other dynamically
	 * allocated resources, so EvalPlanQualSlot() can be used to hold tuples
	 * that *may* need EPQ later, without forcing the overhead of
	 * EvalPlanQualBegin().
	 */
	epqstate->tuple_table = NIL;
	epqstate->relsubs_slot = (TupleTableSlot **)
		palloc0(rtsize * sizeof(TupleTableSlot *));

	/* ... and remember data that EvalPlanQualBegin will need */
	epqstate->plan = subplan;
	epqstate->arowMarks = auxrowmarks;

	/* ... and mark the EPQ state inactive */
	epqstate->origslot = NULL;
	epqstate->recheckestate = NULL;
	epqstate->recheckplanstate = NULL;
	epqstate->relsubs_rowmark = NULL;
	epqstate->relsubs_done = NULL;
}

/*
 * EvalPlanQualSetPlan -- set or change subplan of an EPQState.