Github user adrian-wang commented on the pull request:
https://github.com/apache/spark/pull/4945#issuecomment-93671496
If we don't like what hive does here, we can do it in MySQL way: Convert
all expressions in the list to the type of left handle of IN. In fact the main
differences here is that Spark SQL promotes strings to numeric when do type
coercion, while Hive seems do the contrary.
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