Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19692#discussion_r150751617
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -137,6 +137,8 @@ object TypeCoercion {
case (DateType, TimestampType) => Some(StringType)
case (StringType, NullType) => Some(StringType)
case (NullType, StringType) => Some(StringType)
+ case (n: DecimalType, s: StringType) => Some(DoubleType)
--- End diff --
add a comment to say that there is no proper decimal type we can pick,
using double type is the best we can do.
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