Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22544
After thinking more, I'm going it to merge it to 2.4 directly, because:
1. `ImplicitTypeCasts` handles array type but not map type, which looks a
bug to me
2. I checked all the implementations of `ImplicitCastInputTypes`,
`ElementAt` is the only one that sets a concrete map type as the input type. So
this change only affects `ElementAt`
3. the test cases added in this PR iterate all the cases and have a very
good converage.
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