Github user maropu commented on the issue:
https://github.com/apache/spark/pull/18853
If we change this behaviour, I think we better modify code in
`findCommonTypeForBinaryComparison` of `TypeCoercion` instead of your pr:
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala#L130
```
val findCommonTypeForBinaryComparison: (DataType, DataType) =>
Option[DataType] = {
...
case (l: StringType, r: AtomicType) if r != StringType => Some(r)
case (l: AtomicType, r: StringType) if (l != StringType) => Some(l)
...
}
```
As another option, we could cast `NumericType` to wider `DecimalType`?
Since this change could have some runtime overhead and behaviour change, I'm
not sure this is acceptable. cc @gatorsmile @cloud-fan
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