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The code for wrapping subquery output expressions in PlaceHolderVars believed that if the expression already was a PlaceHolderVar, it was never necessary to wrap that in another one. That's wrong if the expression is underneath an outer join and involves a lateral reference to outside that scope: failing to add an additional PHV risks evaluating the expression at the wrong place and hence not forcing it to null when the outer join should do so. This is an oversight in commit |
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| README | ||
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/.