bdc6cfcd12
Instead of building a separate memory context that's used just for running hash functions, make the hash functions run in the per-tuple context of the node's innerecontext. This saves a little space at runtime, and it avoids needing to reset two contexts instead of one inside buildSubPlanHash's main loop. This largely reverts commit 133924e13. That's safe to do now because bf6c614a2 decoupled the evaluation context used by TupleHashTableMatch from that used for hash function evaluation, so that there's no longer a risk of resetting the innerecontext too soon. Per discussion of bug #19040, although this is not directly a fix for that. Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Haiyang Li <mohen.lhy@alibaba-inc.com> Reviewed-by: Fei Changhong <feichanghong@qq.com> Discussion: https://postgr.es/m/19040-c9b6073ef814f48c@postgresql.org
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/.