Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/13368#discussion_r64979724
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -290,11 +290,6 @@ object TypeCoercion {
// Skip nodes who's children have not been resolved yet.
case e if !e.childrenResolved => e
- case a @ BinaryArithmetic(left @ StringType(), right @
DecimalType.Expression(_, _)) =>
- a.makeCopy(Array(Cast(left, DecimalType.SYSTEM_DEFAULT), right))
- case a @ BinaryArithmetic(left @ DecimalType.Expression(_, _), right
@ StringType()) =>
- a.makeCopy(Array(left, Cast(right, DecimalType.SYSTEM_DEFAULT)))
-
--- End diff --
Hi, @dilipbiswal .
IMHO, the root cause seems to be **decimal multiplication** between
`decimal(38,18)`s.
```
scala> sql("select cast(10 as decimal(38,18)) * cast(10 as
decimal(38,18))").head
res0: org.apache.spark.sql.Row = [null]
```
How do you think about this?
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