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Prior to v14, if we have a MULTIEXPR SubPlan (that is, use of the syntax UPDATE ... SET (c1, ...) = (SELECT ...)) in an UPDATE with an inherited or partitioned target table, inheritance_planner() will clone the targetlist and therefore also the MULTIEXPR SubPlan and the Param nodes referencing it for each child target table. Up to now, we've allowed all the clones to share the underlying subplan as well as the output parameter IDs -- that is, the runtime ParamExecData slots. That technique is borrowed from the far older code that supports initplans, and it works okay in that case because the cloned SubPlan nodes are essentially identical. So it doesn't matter which one of the clones the shared ParamExecData.execPlan field might point to. However, this fails to hold for MULTIEXPR SubPlans, because they can have nonempty "args" lists (values to be passed into the subplan), and those lists could get mutated to different states in the various clones. In the submitted reproducer, as well as the test case added here, one clone contains Vars with varno OUTER_VAR where another has INNER_VAR, because the child tables are respectively on the outer or inner side of the join. Sharing the execPlan pointer can result in trying to evaluate an args list that doesn't match the local execution state, with mayhem ensuing. The result often is to trigger consistency checks in the executor, but I believe this could end in a crash or incorrect updates. To fix, assign new Param IDs to each of the cloned SubPlans, so that they don't share ParamExecData slots at runtime. It still seems fine for the clones to share the underlying subplan, and extra ParamExecData slots are cheap enough that this fix shouldn't cost much. This has been busted since we invented MULTIEXPR SubPlans in 9.5. Probably the lack of previous reports is because query plans in which the different clones of a MULTIEXPR mutate to effectively-different states are pretty rare. There's no issue in v14 and later, because without inheritance_planner() there's never a reason to clone MULTIEXPR SubPlans. Per bug #17596 from Andre Lin. Patch v10-v13 only. Discussion: https://postgr.es/m/17596-c5357f61427a81dc@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/.