chenhao-db

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[SPARK-49275][SQL] Fix return type nullness of the xpath expression

@HyukjinKwon @dongjoon-hyun Could you help review? Thanks!

[SPARK-49275][SQL] Fix return type nullness of the xpath expression

@HyukjinKwon Unfortunately, the behavior is not the same. Running the query in Hive gives a different result: ``` 0: jdbc:hive2://> select xpath('b1b2b3c1c2','a/b'); +------+ | _c0 | +------+ | [] |...

[SPARK-49275][SQL] Fix return type nullness of the xpath expression

In `select xpath('b1b2b3c1c2','a/b');`, the Spark results before and after the change are the same: `[null,null,null]`. The change only marks the return type correctly, but doesn't change the return value. However,...

[SPARK-49275][SQL] Fix return type nullness of the xpath expression

@MaxGekk Yes, I believe this issue has existed since `xpath` was introduced.