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Formerly, subquery pullup had no need to examine other entries in the range table, since they could not contain any references to the subquery being pulled up. That's no longer true with LATERAL, so now we need to be able to visit rangetable subexpressions to replace Vars referencing the pulled-up subquery. Also, this means that extract_lateral_references must be unsurprised at encountering lateral PlaceHolderVars, since such might be created when pulling up a subquery that's underneath an outer join with respect to the lateral reference. |
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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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.