clintropolis opened a new pull request #12210: URL: https://github.com/apache/druid/pull/12210
### Description Follow up to #12078, adds `druid.expressions.homogenizeNullMultiValueStringArrays` with a default value of 'false'. If set to true, it opens an escape hatch to a backwards compatibility mode for the 'buggy' behavior of some multi-value string array functions such as `MV_APPEND` which was fixed in #12078. Prior to that PR, all `null`, `[]`, and `[null]` values were treated as `[null]`, which was only intended for implicitly mapped single value expression across multi-valued string rows, and could produce unintuitive results. This option has been added in case anyone happened to be depending on that behavior, but it produces odd behavior that impacts all array expressions, so it is not recommended to set this flag to true if possible, and instead add a workaround by coercing the values explicitly with additional expressions if needed. <hr> This PR has: - [x] been self-reviewed. - [ ] added documentation for new or modified features or behaviors. - [x] added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links. - [x] added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader. - [x] added unit tests or modified existing tests to cover new code paths, ensuring the threshold for [code coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md) is met. - [x] been tested in a test Druid cluster. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
