Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14389
@petermaxlee , after your patch, `findTightestCommonTypeOfTwo` is only used
by `BinaryOperator` and `JSON schema inference`. I checked all the
`BinaryOperator` implementations, except for something like `And`, `BitwiseOr`
that don't accept decimal types, all other implementations will be handled in
`DecimalPrecision`. This means, there is no expression needs the semantic of
`findTightestCommonTypeOfTwo`: find the tightest common type of two types
without precision loss. Can you check about `JSON schema inference`? If it
doesn't need this semantic either, I think we can safely remove it and only use
`findWiderTypeForTwo`.
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