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transformTableLikeClause believed that it could process extended statistics immediately because "the representation of CreateStatsStmt doesn't depend on column numbers". That was true when extended stats were first introduced, but it was falsified by the addition of extended stats on expressions: the parsed expression tree is fed forward by the LIKE option, and that will contain Vars. So if the new table doesn't have attnums identical to the old one's (typically because there are some dropped columns in the old one), that doesn't work. The CREATE goes through, but it emits invalid statistics objects that will cause problems later. Fortunately, we already have logic that can adapt expression trees to the possibly-new column numbering. To use it, we have to delay processing of CREATE_TABLE_LIKE_STATISTICS into expandTableLikeClause, just as for other LIKE options that involve expressions. Per bug #18468 from Alexander Lakhin. Back-patch to v14 where extended statistics on expressions were added. Discussion: https://postgr.es/m/18468-f5add190e3fa5902@postgresql.org |
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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/.