627d63419e
This commit allows transformation of OR-clauses into SAOP's for index scans
within nested loop joins. That required the following changes.
1. Make match_orclause_to_indexcol() and group_similar_or_args() understand
const-ness in the same way as match_opclause_to_indexcol(). This
generally makes our approach more uniform.
2. Make match_join_clauses_to_index() pass OR-clauses to
match_clause_to_index().
3. Also switch match_join_clauses_to_index() to use list_append_unique_ptr()
for adding clauses to *joinorclauses. That avoids possible duplicates
when processing the same clauses with different indexes. Previously such
duplicates were elimited in match_clause_to_index(), but now
group_similar_or_args() each time generates distinct copies of grouped
OR clauses.
Discussion: https://postgr.es/m/CAPpHfdv%2BjtNwofg-p5z86jLYZUTt6tR17Wy00ta0dL%3DwHQN3ZA%40mail.gmail.com
Reviewed-by: Andrei Lepikhov <lepihov@gmail.com>
Reviewed-by: Alena Rybakina <a.rybakina@postgrespro.ru>
Reviewed-by: Pavel Borisov <pashkin.elfe@gmail.com>
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.