database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-18 02:02:55 +03:00
Code Activity

Minor additional refactoring of planner.c's PathTarget handling.

Browse Source 
Teach make_group_input_target() and make_window_input_target() to work
entirely with the PathTarget representation of tlists, rather than
constructing a tlist and immediately deconstructing it into PathTarget
format.  In itself this only saves a few palloc's; the bigger picture is
that it opens the door for sharing cost_qual_eval work across all of
planner.c's constructions of PathTargets.  I'll come back to that later.

In support of this, flesh out tlist.c's infrastructure for PathTargets
a bit more.
This commit is contained in:
Tom Lane
2016-03-11 10:24:33 -05:00
parent 92f03fe76f
commit 49635d7b3e
3 changed files with 111 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
src/include/optimizer/tlist.h
View File

@@ -55,8 +55,11 @@ extern bool grouping_is_hashable(List *groupClause);
extern PathTarget *make_pathtarget_from_tlist(List *tlist);
extern List *make_tlist_from_pathtarget(PathTarget *target);
extern PathTarget *copy_pathtarget(PathTarget *src);
extern PathTarget *create_empty_pathtarget(void);
extern void add_column_to_pathtarget(PathTarget *target,
Expr *expr, Index sortgroupref);
extern void add_new_column_to_pathtarget(PathTarget *target, Expr *expr);
extern void add_new_columns_to_pathtarget(PathTarget *target, List *exprs);
extern void apply_pathtarget_labeling_to_tlist(List *tlist, PathTarget *target);
/* Convenience macro to get a PathTarget with valid cost/width fields */