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postgres_fdw: Push down FULL JOINs with restriction clauses.

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The previous deparsing logic wasn't smart enough to produce subqueries
when deparsing; make it smart enough to do that.  However, we only do
it that way when necessary, because it generates more complicated SQL
which will be harder for any humans reading the queries to understand.

Etsuro Fujita, reviewed by Ashutosh Bapat

Discussion: http://postgr.es/m/c449261a-b033-dc02-9254-2fe5b7044795@lab.ntt.co.jp
This commit is contained in:
Robert Haas
2017-03-16 13:34:59 -04:00
parent a3eac988c2
commit b30fb56b07
5 changed files with 498 additions and 40 deletions
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16
contrib/postgres_fdw/postgres_fdw.h
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@ -95,6 +95,20 @@ typedef struct PgFdwRelationInfo
/* Grouping information */
List *grouped_tlist;
/* Subquery information */
bool make_outerrel_subquery; /* do we deparse outerrel as a
* subquery? */
bool make_innerrel_subquery; /* do we deparse innerrel as a
* subquery? */
Relids lower_subquery_rels; /* all relids appearing in lower
* subqueries */
/*
* Index of the relation. It is used to create an alias to a subquery
* representing the relation.
*/
int relation_index;
} PgFdwRelationInfo;
/* in postgres_fdw.c */
@ -161,7 +175,7 @@ extern Expr *find_em_expr_for_rel(EquivalenceClass *ec, RelOptInfo *rel);
extern List *build_tlist_to_deparse(RelOptInfo *foreignrel);
extern void deparseSelectStmtForRel(StringInfo buf, PlannerInfo *root,
RelOptInfo *foreignrel, List *tlist,
List *remote_conds, List *pathkeys,
List *remote_conds, List *pathkeys, bool is_subquery,
List **retrieved_attrs, List **params_list);
/* in shippable.c */