Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/8983#issuecomment-145689983
if you change the `value` type to boolean, then we have to change each
element in `list` to boolean type too, which maybe dangerous as a lot of types
can't be casted to boolean. See
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types#LanguageManualTypes-AllowedImplicitConversions
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