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If a subquery has been flattened into its parent, the joinaliasvars entries of a join above it can be arbitrary expressions rather than plain Vars, so expanding a reference to such a join alias may insert a SubLink into a lower-level subquery. flatten_join_alias_vars_mutator detects that and sets the subquery's hasSubLinks flag, but only in the single-column code path; the whole-row path just asserted in a comment that its recursive call would handle this, which is true only when the alias entry is itself a Var referencing another join. Hence a whole-row reference to such a join appearing in a sub-select left that sub-select's hasSubLinks false, so preprocess_expression skipped SS_process_sublinks for it, and the unprocessed SubLink reached code that is not prepared for one: this produced "cannot handle unplanned sub-select" from cost_qual_eval, an assertion failure in preprocess_aggrefs, or "unrecognized node type" at execution, depending on where in the sub-select the SubLink ended up. To fix, make the same check in the whole-row expansion path. Back-patch to all supported branches. Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Ayush Tiwari <ayushtiwari.slg01@gmail.com> Discussion: https://postgr.es/m/CAMbWs49PgeNFhQTZ2gSzwatF0_LXyegMPGt++jSfxUN7NZuQ5Q@mail.gmail.com Backpatch-through: 14
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/.