Function ExecPrepareQual

src/backend/executor/execExpr.c:785–800

* ExecPrepareQual --- initialize for qual execution outside a normal * Plan tree context. * * This differs from ExecInitQual in that we don't assume the caller is * already running in the EState's per-query context. Also, we run the * passed expression tree through expression_planner() to prepare it for * execution. (In ordinary Plan trees the regular planning process will have * made the

 * expressions this won't have happened.)
 */
ExprState *
ExecPrepareQual(List *qual, EState *estate)
{
	ExprState  *result;
	MemoryContext oldcontext;

	oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);

	qual = (List *) expression_planner((Expr *) qual);

	result = ExecInitQual(qual, NULL);

	MemoryContextSwitchTo(oldcontext);

	return result;
}

/*
 * ExecPrepareCheck -- initialize check constraint for execution outside a