| From: | David Rowley <drowley(at)postgresql(dot)org> |
|---|---|
| To: | pgsql-committers(at)lists(dot)postgresql(dot)org |
| Subject: | pgsql: Consider cheap startup paths in add_paths_to_append_rel |
| Date: | 2023-10-05 08:04:05 |
| Message-ID: | E1qoJL3-0007tE-14@gemulon.postgresql.org |
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| Lists: | pgsql-committers |
Consider cheap startup paths in add_paths_to_append_rel
6b94e7a6d did this for ordered append paths to allow fast startup
MergeAppends, however, nothing was done for the Append case.
Here we adjust add_paths_to_append_rel() to have it build an AppendPath
containing the cheapest startup paths from each of the child relations
when the append rel has "consider_startup" set.
Author: Andy Fan, David Rowley
Discussion: https://www.postgresql.org/message-id/CAKU4AWrXSkUV=Pt-gRxQT7EbfUeNssprGyNsB=5mJibFZ6S3ww@mail.gmail.com
Branch
------
master
Details
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https://git.postgresql.org/pg/commitdiff/a8a968a8212ee3ef7f22795c834b33d871fac262
Modified Files
--------------
src/backend/optimizer/path/allpaths.c | 21 +++++++++++++++++++++
src/test/regress/expected/union.out | 21 +++++++++++++++++++++
src/test/regress/sql/union.sql | 11 +++++++++++
3 files changed, 53 insertions(+)
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