d4378c0005
This commit makes match_clause_to_indexcol() match "(indexkey op C1) OR (indexkey op C2) ... (indexkey op CN)" expression to the index while transforming it into "indexkey op ANY(ARRAY[C1, C2, ...])" (ScalarArrayOpExpr node). This transformation allows handling long OR-clauses with single IndexScan avoiding diving them into a slower BitmapOr. We currently restrict Ci to be either Const or Param to apply this transformation only when it's clearly beneficial. However, in the future, we might switch to a liberal understanding of constants, as it is in other cases. Discussion: https://postgr.es/m/567ED6CA.2040504%40sigaev.ru Author: Alena Rybakina, Andrey Lepikhov, Alexander Korotkov Reviewed-by: Peter Geoghegan, Ranier Vilela, Alexander Korotkov, Robert Haas Reviewed-by: Jian He, Tom Lane, Nikolay Shaplov
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/.