raminqaf commented on PR #28140:
URL: https://github.com/apache/flink/pull/28140#issuecomment-4428057152
> Quick question: Does the name change from `regexpExtract` to
`REGEXP_EXTRACT` affect backward compatibility for `call("regexpExtract", ...)`
usage in Table API?
>
> SQL and Expression API should be fine, but wondering if anyone uses the
string-based `call()` syntax with the old camelCase name.
Correct, call("regexpExtract", ...) (camelCase) no longer resolves. The
reason is that `CoreModule` keys functions by
`definition.getName().toUpperCase()`. Before this change the registered name
was "regexpExtract" → uppercased to "REGEXPEXTRACT" (no underscore). However,
calls like `call("regexp_Extract", ...)` would still pass.
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