gianm commented on pull request #11327: URL: https://github.com/apache/druid/pull/11327#issuecomment-860951542
> Generally LGTM. Could you take a look at ConcatOperatorConversion too? I think it should also be "cascade nullable". Or maybe not: - PostgreSQL CONCAT ignores nulls, and `||` returns null if any argument is null: https://www.postgresql.org/docs/13/functions-string.html, http://sqlfiddle.com/#!17/5821c5/2 - MySQL CONCAT returns null if any argument is null, and doesn't seem to support the `||` operator: https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_concat, http://sqlfiddle.com/#!9/180f8e/1 - BigQuery CONCAT returns NULL if any input argument is NULL; it mentions support for `||` but doesn't say how it will handle nulls: https://cloud.google.com/bigquery/docs/reference/standard-sql/string_functions -- 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. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
