Horton

Fix error reporting for SQL/JSON path type mismatches

Amit Langote <amitlan@postgresql.org>

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Commit: 519fa0433b37701b357753a568080bee2c47d238
Author: Amit Langote <amitlan@postgresql.org>
Date: 2025-11-27T03:07:01Z
Releases: 19 (unreleased) 
Fix error reporting for SQL/JSON path type mismatches

transformJsonFuncExpr() used exprType()/exprLocation() on the
possibly coerced path expression, which could be NULL when
coercion to jsonpath failed, leading to "cache lookup failed
for type 0" errors.

Preserve the original expression node so that type and location
in the "must be of type jsonpath" error are reported correctly.
Add regression tests to cover these cases.

Reported-by: Jian He <jian.universality@gmail.com>
Author: Jian He <jian.universality@gmail.com>
Reviewed-by: Kirill Reshke <reshkekirill@gmail.com>
Discussion: https://postgr.es/m/CACJufxHunVg81JMuNo8Yvv_hJD0DicgaVN2Wteu8aJbVJPBjZA@mail.gmail.com
Backpatch-through: 17

Files

PathChange+/−
src/backend/parser/parse_expr.c modified +15 −8
src/test/regress/expected/sqljson_queryfuncs.out modified +8 −0
src/test/regress/sql/sqljson_queryfuncs.sql modified +2 −0

Discussion