Github user tarekauel commented on a diff in the pull request:
https://github.com/apache/spark/pull/7534#discussion_r34976235
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -593,12 +593,7 @@ case class Substring(str: Expression, pos: Expression,
len: Expression)
override def foldable: Boolean = str.foldable && pos.foldable &&
len.foldable
override def nullable: Boolean = str.nullable || pos.nullable ||
len.nullable
- override def dataType: DataType = {
- if (!resolved) {
- throw new UnresolvedException(this, s"Cannot resolve since $children
are not resolved")
- }
- if (str.dataType == BinaryType) str.dataType else StringType
- }
+ override def dataType: DataType = StringType
--- End diff --
@rxin This simplification is correct, isn't it? The expression extends
`ImplicitCastInputTypes`, because of that `BinaryType` can be casted to
`StringType`
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