Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/993#discussion_r13479648
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -23,6 +23,16 @@ import org.apache.spark.sql.catalyst.types.DataType
import org.apache.spark.sql.catalyst.types.StringType
import org.apache.spark.sql.catalyst.types.BooleanType
+case class SubString(string: Expression, start: Expression, end:
Expression) extends Expression {
+ def children = string :: start :: end :: Nil
+ def references = children.flatMap(_.references).toSet
+ def dataType = StringType
+ def nullable = string.nullable
+
+ override def eval(input: Row) = ???
--- End diff --
should this be filled in?
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