turboFei commented on a change in pull request #26485: [SPARK-29860][SQL] Fix
dataType mismatch issue for InSubquery.
URL: https://github.com/apache/spark/pull/26485#discussion_r346102117
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
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@@ -93,6 +93,14 @@ object TypeCoercion {
Some(t2)
case (t1: DecimalType, t2: IntegralType) if t1.isWiderThan(t2) =>
Some(t1)
+ case (t1: DecimalType, t2: DecimalType) =>
+ // Handle two decimal type here and don't allow precision loss.
+ val widerType = DecimalPrecision.widerDecimalType(t1, t2)
+ if (widerType.isWiderThan(t1) && widerType.isWiderThan(t2)) {
+ Some(widerType)
+ } else {
+ None
+ }
Review comment:
But I think for two decimalType, such as Decimal(3,0) and Decimal(3,2),
their tightest common type should be Decimal(5,2).
It is consistent with the method name findTightestCommonType.
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