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
 ##########
 @@ -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:
   I think for two decimalType, such as Decimal(3,0) and Decimal(3,2), their 
tightest common type should be Decimal(5,2), which is consistent with the 
method name findTightestCommonType.

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