Function ExecInitBitmapAnd

src/backend/executor/nodeBitmapAnd.c:56–106

---------------------------------------------------------------- * ExecInitBitmapAnd * * Begin all of the subscans of the BitmapAnd node. * ---------------------------------------------------------------- */

 * ----------------------------------------------------------------
 */
BitmapAndState *
ExecInitBitmapAnd(BitmapAnd *node, EState *estate, int eflags)
{
	BitmapAndState *bitmapandstate;
	PlanState **bitmapplanstates;
	int			nplans;
	int			i;
	ListCell   *l;
	Plan	   *initNode;

	/* check for unsupported flags */
	Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));

	/*
	 * Set up empty vector of subplan states
	 */
	nplans = list_length(node->bitmapplans);

	bitmapandstate = makeNode(BitmapAndState);
	bitmapplanstates = (PlanState **) palloc0(nplans * sizeof(PlanState *));

	/*
	 * create new BitmapAndState for our BitmapAnd node
	 */
	bitmapandstate->ps.plan = (Plan *) node;
	bitmapandstate->ps.state = estate;
	bitmapandstate->ps.ExecProcNode = ExecBitmapAnd;
	bitmapandstate->bitmapplans = bitmapplanstates;
	bitmapandstate->nplans = nplans;

	/*
	 * call ExecInitNode on each of the plans to be executed and save the
	 * results into the array "bitmapplanstates".
	 */
	i = 0;
	foreach(l, node->bitmapplans)
	{
		initNode = (Plan *) lfirst(l);
		bitmapplanstates[i] = ExecInitNode(initNode, estate, eflags);
		i++;
	}

	/*
	 * Miscellaneous initialization
	 *
	 * BitmapAnd plans don't have expression contexts because they never call
	 * ExecQual or ExecProject.  They don't need any tuple slots either.
	 */

	return bitmapandstate;
}

/* ----------------------------------------------------------------
 *	   MultiExecBitmapAnd