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If there are any SRFs in a PathTarget, we must separate it into SRF-computing and SRF-free targets. This is because the executor can only handle SRFs that appear at the top level of the targetlist of a ProjectSet plan node. If we find a subexpression that matches an expression already computed in the previous plan level, we should treat it like a Var and should not split it again. setrefs.c will later replace the expression with a Var referencing the subplan output. However, when processing the grouping target for grouping sets, the planner can fail to recognize that an expression is already computed in the scan/join phase. The root cause is a mismatch in the nullingrels bits. Expressions in the grouping target carry the grouping nulling bit in their nullingrels to indicate that they can be nulled by the grouping step. However, the corresponding expressions in the scan/join target do not have these bits. As a result, the exact match check in list_member() fails, leading the planner to incorrectly believe that the expression needs to be re-evaluated from its arguments, which are often not available in the subplan. This can lead to planner errors such as "variable not found in subplan target list". To fix, ignore the grouping nulling bit when checking whether an expression from the grouping target is available in the pre-grouping input target. This aligns with the matching logic in setrefs.c. Backpatch to v18, where this issue was introduced. Bug: #19353 Reported-by: Marian MULLER REBEYROL <marian.muller@serli.com> Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Tender Wang <tndrwang@gmail.com> Discussion: https://postgr.es/m/19353-aaa179bba986a19b@postgresql.org Backpatch-through: 18
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.
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