cfmcgrady commented on a change in pull request #32488:
URL: https://github.com/apache/spark/pull/32488#discussion_r642861146
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/UnwrapCastInBinaryComparison.scala
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@@ -121,6 +131,77 @@ object UnwrapCastInBinaryComparison extends
Rule[LogicalPlan] {
if canImplicitlyCast(fromExp, toType, literalType) =>
simplifyNumericComparison(be, fromExp, toType, value)
+ // As the analyzer makes sure that the list of In is already of the same
data type, then the
+ // rule can simply check the first literal in `in.list` can implicitly
cast to `toType` or not,
+ // and note that:
+ // 1. this rule doesn't convert in when `in.list` is empty.
+ // 2. this rule only handles the case when both `fromExp` and value in
`in.list` are of numeric
+ // type.
+ case in @ In(Cast(fromExp, toType: NumericType, _), list @ Seq(firstLit,
_*))
+ if canImplicitlyCast(fromExp, toType, firstLit.dataType) &&
in.inSetConvertible =>
+ val (newValueList, expr) =
+ list.map(lit => unwrapCast(EqualTo(in.value, lit)))
+ .partition {
+ case EqualTo(_, _: Literal) => true
+ case And(IsNull(_), Literal(null, BooleanType)) => false
+ case _ => throw new IllegalStateException("Illegal unwrap cast
result found.")
+ }
+
+ val (nonNullValueList, nullValueList) = newValueList.partition {
+ case EqualTo(_, NonNullLiteral(_, _: NumericType)) => true
+ case EqualTo(_, Literal(null, _)) => false
+ case _ => throw new IllegalStateException("Illegal unwrap cast result
found.")
+ }
+ // make sure the new return list have the same dataType.
+ val newList = {
+ if (nonNullValueList.nonEmpty) {
+ // cast the null value to the dataType of nonNullValueList
+ // when the nonNullValueList is nonEmpty.
+ nullValueList.map {
+ case EqualTo(_, lit) =>
+ Cast(lit,
nonNullValueList.head.asInstanceOf[EqualTo].left.dataType)
+ } ++ nonNullValueList.map {case EqualTo(_, lit) => lit}
+ } else {
+ // the new value list only contains null value,
+ // cast the null value to fromExp.dataType.
+ nullValueList.map {
+ case EqualTo(_, lit) =>
+ Cast(lit, fromExp.dataType)
Review comment:
The same with `nonNullValueList.nonEmpty`, when the in.list only
contains value `null`, the `unwrapCast` returns the original expression and the
original literal.datatype (same with toType) may difference from
`fromExp.dataType`. We should make sure the value in in.list has the same data
type as in.value.
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