Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/19602
In general cast is hard to be pushed into data source, e.g. `cast(a as
string) = string` if a is int, how should data source handle it?
In the meanwhile, I think we can omit most of the cast in the format of
`attribute = literal`. e.g. `cast(byteCol as int) = 0`, we know `0` is within
byte range, we can convert it to `byteCol = (byte) 0`.
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