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Rename find_em_expr_usable_for_sorting_rel.

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I didn't particularly like this function name, as it fails to
express what's going on.  Also, returning the sort expression
alone isn't too helpful --- typically, a caller would also
need some other fields of the EquivalenceMember.  But the
sole caller really only needs a bool result, so let's make
it "bool relation_can_be_sorted_early()".

Discussion: https://postgr.es/m/91f3ec99-85a4-fa55-ea74-33f85a5c651f@swarm64.com
This commit is contained in:
Tom Lane
2021-04-20 11:37:36 -04:00
parent 3753982441
commit 7645376774
3 changed files with 28 additions and 27 deletions
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7
src/include/optimizer/paths.h
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@@ -144,10 +144,9 @@ extern EquivalenceMember *find_computable_ec_member(PlannerInfo *root,
Relids relids,
bool require_parallel_safe);
extern Expr *find_em_expr_for_rel(EquivalenceClass *ec, RelOptInfo *rel);
extern Expr *find_em_expr_usable_for_sorting_rel(PlannerInfo *root,
EquivalenceClass *ec,
RelOptInfo *rel,
bool require_parallel_safe);
extern bool relation_can_be_sorted_early(PlannerInfo *root, RelOptInfo *rel,
EquivalenceClass *ec,
bool require_parallel_safe);
extern void generate_base_implied_equalities(PlannerInfo *root);
extern List *generate_join_implied_equalities(PlannerInfo *root,
Relids join_relids,