/* ------------------------------------------------------------
*
* Routines copied from core PostgreSQL implementation
*
* ------------------------------------------------------------
*/
void
show_scan_qual(List *qual, const char *qlabel,
PlanState *planstate, List *ancestors,
ExplainState *es)
{
bool useprefix;
Node *node;
List *context;
char *exprstr;
useprefix = (IsA(planstate->plan, SubqueryScan) || es->verbose);
/* No work if empty qual */
if (qual == NIL)
return;
/* Convert AND list to explicit AND */
node = (Node *) make_ands_explicit(qual);
/* Set up deparsing context */
context = deparse_context_for_planstate((Node *) planstate,
ancestors,
es->rtable,
es->rtable_names);
/* Deparse the expression */
exprstr = deparse_expression(node, context, useprefix, false);
/* And add to es->str */
ExplainPropertyText(qlabel, exprstr, es);
}
/*
* get_proposed_default_constraint
*
* This function returns the negation of new_part_constraints, which
* would be an integral part of the default partition constraints after
* addition of the partition to which the new_part_constraints belongs.
*/
List *
get_proposed_default_constraint(List *new_part_constraints)
{
Expr *defPartConstraint;
defPartConstraint = make_ands_explicit(new_part_constraints);
/*
* Derive the partition constraints of default partition by negating the
* given partition constraints. The partition constraint never evaluates
* to NULL, so negating it like this is safe.
*/
defPartConstraint = makeBoolExpr(NOT_EXPR,
list_make1(defPartConstraint),
-1);
/* Simplify, to put the negated expression into canonical form */
defPartConstraint =
(Expr *) eval_const_expressions(NULL,
(Node *) defPartConstraint);
defPartConstraint = canonicalize_qual(defPartConstraint, true);
return make_ands_implicit(defPartConstraint);
}
