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Cosmetic improvements for code related to partitionwise join.

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Move have_partkey_equi_join and match_expr_to_partition_keys to
relnode.c, since they're used only there.  Refactor
build_joinrel_partition_info to split out the code that fills the
joinrel's partition key lists; this doesn't have any non-cosmetic
impact, but it seems like a useful separation of concerns.
Improve assorted nearby comments.

Amit Langote, with a little further editorialization by me

Discussion: https://postgr.es/m/CA+HiwqG2WVUGmLJqtR0tPFhniO=H=9qQ+Z3L_ZC+Y3-EVQHFGg@mail.gmail.com
This commit is contained in:
Tom Lane
2020-04-03 17:00:25 -04:00
parent 21dc48840c
commit 0568e7a2a4
5 changed files with 283 additions and 234 deletions
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3
src/include/optimizer/paths.h
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@@ -106,9 +106,6 @@ extern bool have_join_order_restriction(PlannerInfo *root,
extern bool have_dangerous_phv(PlannerInfo *root,
Relids outer_relids, Relids inner_params);
extern void mark_dummy_rel(RelOptInfo *rel);
extern bool have_partkey_equi_join(RelOptInfo *joinrel,
RelOptInfo *rel1, RelOptInfo *rel2,
JoinType jointype, List *restrictlist);
/*
* equivclass.c