amaliujia commented on code in PR #38047:
URL: https://github.com/apache/spark/pull/38047#discussion_r983853197
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala:
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@@ -751,6 +753,43 @@ abstract class TypeCoercionBase {
}
}
+ /**
+ * Casts types according to bucket info for Equality expression.
+ */
+ object EqualityTypeCasts extends TypeCoercionRule {
+
+ private def isIntegralTypes(exprs: Seq[Expression]): Boolean = {
+ exprs.map(_.dataType).forall {
+ case _: IntegralType => true
+ case DecimalType.Fixed(_, 0) => true
+ case _ => false
+ }
+ }
+
+ override val transform: PartialFunction[Expression, Expression] = {
+ case b @ Equality(left: Attribute, right: Attribute)
+ if b.childrenResolved && left.dataType != right.dataType &&
isIntegralTypes(b.children) =>
Review Comment:
Why we don't care what `left.dataType` is? The test added in
`TypeCoercionSuite.scala` only tests Integer, Long and Decimal. If we don't
have a constraint on the `left.dataType` probably we need to test more types?
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