Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/7605#discussion_r35396780
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala
---
@@ -563,7 +512,7 @@ object HiveTypeCoercion {
case e if !e.childrenResolved => e
case Cast(e @ StringType(), t: IntegralType) =>
- Cast(Cast(e, DecimalType.Unlimited), t)
+ Cast(Cast(e, DecimalType.forType(LongType)), t)
--- End diff --
I'd to use the lowest precision if possible, it give up a chance to
optimize it. Also, if the string has more precision than expected, using lowest
precision to cast will fail earlier.
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