stevomitric opened a new pull request, #48642: URL: https://github.com/apache/spark/pull/48642
### What changes were proposed in this pull request? The behavior of `StringToMap` expression accepts third and second parameters as regular expressions, as per the [docs](https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/api/pyspark.sql.functions.str_to_map.html). For collated strings we handle regular expressions through collation aware regex flags with `java.regex`. In this PR the behavior for collated strings was adjusted to work with these flags - the current implementation is not regex-aware. ### Why are the changes needed? To fix a correctness issue with collated version of `StringToMap`. ### Does this PR introduce _any_ user-facing change? Yes, the collated behavior of `StringToMap` was changed. The following query returns different results: ```sql select str_to_map('a:b,c:d' collate utf8_lcase, ',', '[:]+') -- current behavior: Map('a:b,c:d' -> null) -- new behavior: Map('a' -> 'b', 'c' -> 'd') ``` ### How was this patch tested? New tests in this PR and existing tests. ### Was this patch authored or co-authored using generative AI tooling? No -- 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]
