zheniantoushipashi opened a new pull request #33201:
URL: https://github.com/apache/spark/pull/33201
### What changes were proposed in this pull request?
The canCast method of type of char/varchar is modified to be consistent with
StringType
the method cast will change the type char/varchar to StringType
def cast(to: DataType): Column = withExpr {
val cast = Cast(expr,
CharVarcharUtils.replaceCharVarcharWithStringForCast(to))
cast.setTagValue(Cast.USER_SPECIFIED_CAST, true)
cast
}
The canCast method of type of char/varchar must be consistent with
StringType
### Why are the changes needed?
Before I used stringType instead of char/varchar, my application code has
the logic to judge using canCast. There was no problem before, but now it’s
changed to char/varchar, and the judgment of canCast fails. If it doesn’t pass,
I Need to change a lot of application code
### Does this PR introduce _any_ user-facing change?
no
### How was this patch tested?
i add UT。
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