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After pulling up LATERAL subqueries, we may have qual clauses that refer to relations outside their syntactic scope. Before doing any such pullup, prepjointree.c checks to make sure that it wouldn't create a semantically-invalid situation; but we leave it to deconstruct_jointree() to actually move these quals up the join tree to a place where they can be evaluated. In commit 2489d76c4, I (tgl) refactored deconstruct_jointree() in a way that caused assertion failures while moving such quals, because the new logic failed to distinguish "this jointree node is a parent of the source one" from "this jointree node is processed after the source one in depth-first order". Fix this, and at the same time reduce the overhead a bit, by getting rid of the common PostponedQual list and instead making each JoinTreeItem contain a list of quals that needed to be postponed to its level. We can help distribute_qual_to_rels find the appropriate JoinTreeItem efficiently by adding parent-item links to the JoinTreeItem data structure. This ends up being the same number of relid subset checks as the original (pre-bug) logic, but less list manipulation is required during multi-level postponements. Richard Guo and Tom Lane, per bug #17768 from Robins Tharakan. Discussion: https://postgr.es/m/17768-5ac8730ece54478f@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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.