Function ExecInitLockRows

src/backend/executor/nodeLockRows.c:291–376

---------------------------------------------------------------- * ExecInitLockRows * * This initializes the LockRows node state structures and * the node's subplan. * ---------------------------------------------------------------- */

 * ----------------------------------------------------------------
 */
LockRowsState *
ExecInitLockRows(LockRows *node, EState *estate, int eflags)
{
	LockRowsState *lrstate;
	Plan	   *outerPlan = outerPlan(node);
	List	   *epq_arowmarks;
	ListCell   *lc;

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

	/*
	 * create state structure
	 */
	lrstate = makeNode(LockRowsState);
	lrstate->ps.plan = (Plan *) node;
	lrstate->ps.state = estate;
	lrstate->ps.ExecProcNode = ExecLockRows;

	/*
	 * Miscellaneous initialization
	 *
	 * LockRows nodes never call ExecQual or ExecProject, therefore no
	 * ExprContext is needed.
	 */

	/*
	 * Initialize result type.
	 */
	ExecInitResultTypeTL(&lrstate->ps);

	/*
	 * then initialize outer plan
	 */
	outerPlanState(lrstate) = ExecInitNode(outerPlan, estate, eflags);

	/* node returns unmodified slots from the outer plan */
	lrstate->ps.resultopsset = true;
	lrstate->ps.resultops = ExecGetResultSlotOps(outerPlanState(lrstate),
												 &lrstate->ps.resultopsfixed);

	/*
	 * LockRows nodes do no projections, so initialize projection info for
	 * this node appropriately
	 */
	lrstate->ps.ps_ProjInfo = NULL;

	/*
	 * Locate the ExecRowMark(s) that this node is responsible for, and
	 * construct ExecAuxRowMarks for them.  (InitPlan should already have
	 * built the global list of ExecRowMarks.)
	 */
	lrstate->lr_arowMarks = NIL;
	epq_arowmarks = NIL;
	foreach(lc, node->rowMarks)
	{
		PlanRowMark *rc = lfirst_node(PlanRowMark, lc);
		ExecRowMark *erm;