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authorAmit Langote <amitlan@postgresql.org>2024-09-09 11:55:38 +0900
committerAmit Langote <amitlan@postgresql.org>2024-09-09 15:59:06 +0900
commit77aebe9a8d3cccd4c54b43be87a38f2bae614c76 (patch)
tree4f8c492c61f8457d9e9657b67c6bbb62e8694c7a /src/backend/utils/adt/jsonpath_exec.c
parentcd6b2ae3e7f64c881cb0159a2f9fc8d475e06d82 (diff)
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SQL/JSON: Avoid initializing unnecessary ON ERROR / ON EMPTY steps
When the ON ERROR / ON EMPTY behavior is to return NULL, returning NULL directly from ExecEvalJsonExprPath() suffices. Therefore, there's no need to create separate steps to check the error/empty flag or those to evaluate the the constant NULL expression. This speeds up common cases because the default ON ERROR / ON EMPTY behavior for JSON_QUERY() and JSON_VALUE() is to return NULL. However, these steps are necessary if the RETURNING type is a domain, as constraints on the domain may need to be checked. Reported-by: Jian He <jian.universality@gmail.com> Author: Jian He <jian.universality@gmail.com> Author: Amit Langote <amitlangote09@gmail.com> Discussion: https://postgr.es/m/CACJufxEo4sUjKCYtda0_qt9tazqqKPmF1cqhW9KBOUeJFqQd2g@mail.gmail.com Backpatch-through: 17
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