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fb9f955025f optimized code generation by using specialized variants of ExecSeqScan* for [not] having a qual, projection etc. This allowed the compiler to optimize the code out the code for qual / projection. However, as observed by David Rowley at the time, the compiler couldn't prove the opposite, i.e. that the qual etc *are* present. By using pg_assume(), introduced in d65eb5b1b84, we can tell the compiler that the relevant variables are non-null. This reduces the code size to a surprising degree and seems to lead to a small but reproducible performance gain. Reviewed-by: Amit Langote <amitlangote09@gmail.com> Discussion: https://postgr.es/m/CA+HiwqFk-MbwhfX_kucxzL8zLmjEt9MMcHi2YF=DyhPrSjsBEA@mail.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/.