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Avoid retrieving dummy NULL columns in postgres_fdw.

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This should provide some marginal overall savings, since it surely takes
many more cycles for the remote server to deal with the NULL columns than
it takes for postgres_fdw not to emit them.  But really the reason is to
keep the emitted queries from looking quite so silly ...
This commit is contained in:
Tom Lane
2013-03-22 00:31:11 -04:00
parent 9cbc4b80dd
commit e690b95150
5 changed files with 301 additions and 218 deletions
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15
contrib/postgres_fdw/postgres_fdw.h
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@ -49,7 +49,8 @@ extern bool is_foreign_expr(PlannerInfo *root,
extern void deparseSelectSql(StringInfo buf,
PlannerInfo *root,
RelOptInfo *baserel,
Bitmapset *attrs_used);
Bitmapset *attrs_used,
List **retrieved_attrs);
extern void appendWhereClause(StringInfo buf,
PlannerInfo *root,
RelOptInfo *baserel,
@ -58,14 +59,18 @@ extern void appendWhereClause(StringInfo buf,
List **params);
extern void deparseInsertSql(StringInfo buf, PlannerInfo *root,
Index rtindex, Relation rel,
List *targetAttrs, List *returningList);
List *targetAttrs, List *returningList,
List **retrieved_attrs);
extern void deparseUpdateSql(StringInfo buf, PlannerInfo *root,
Index rtindex, Relation rel,
List *targetAttrs, List *returningList);
List *targetAttrs, List *returningList,
List **retrieved_attrs);
extern void deparseDeleteSql(StringInfo buf, PlannerInfo *root,
Index rtindex, Relation rel,
List *returningList);
List *returningList,
List **retrieved_attrs);
extern void deparseAnalyzeSizeSql(StringInfo buf, Relation rel);
extern void deparseAnalyzeSql(StringInfo buf, Relation rel);
extern void deparseAnalyzeSql(StringInfo buf, Relation rel,
List **retrieved_attrs);
#endif /* POSTGRES_FDW_H */