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| author | Amit Langote <amitlan@postgresql.org> | 2024-09-09 13:46:58 +0900 |
|---|---|---|
| committer | Amit Langote <amitlan@postgresql.org> | 2024-09-09 13:46:58 +0900 |
| commit | dd8bea88abf4794d99270ced884a8bc1e387255d (patch) | |
| tree | d1be3ffc41c4ebfec668ec92789a06270661500f /contrib/xml2/xpath.c | |
| parent | 87b6c3c0b703c3a71bc640f456a24937744ff30b (diff) | |
| download | postgresql-dd8bea88abf4794d99270ced884a8bc1e387255d.tar.gz postgresql-dd8bea88abf4794d99270ced884a8bc1e387255d.zip | |
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
Diffstat (limited to 'contrib/xml2/xpath.c')
0 files changed, 0 insertions, 0 deletions