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Preprocessing of the HAVING clause will reduce havingQual to NIL if the clause is constant-TRUE. This is one case where that convention is rather unfortunate, because "HAVING TRUE" is not at all the same as not having any HAVING clause at all. (Per the SQL spec, it still forces the query to be grouped.) The planner deals with this by having a boolean hasHavingQual that records whether havingQual was originally nonempty; places that just want to check whether HAVING was specified are supposed to consult that. I found three places that got that wrong. Fortunately, these could only affect cost estimates not correctness. It'd be hard even to demonstrate the errors; for example, the one in allpaths.c would only matter in a query that has HAVING TRUE but no GROUP BY and no aggregates, which would require a completely variable-free SELECT list, making the case probably of only academic interest. Hence, while these are worth fixing before someone copies the incorrect coding somewhere more critical, they don't seem worth back-patching. I didn't bother trying to devise regression tests, either. Discussion: https://postgr.es/m/2503888.1666042643@sss.pgh.pa.us |
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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: 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/.