Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/224#discussion_r10928230
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -20,10 +20,114 @@ package catalyst
package expressions
import org.apache.spark.sql.catalyst.types.BooleanType
+import java.util.regex.Pattern
-case class Like(left: Expression, right: Expression) extends
BinaryExpression {
- def dataType = BooleanType
- def nullable = left.nullable // Right cannot be null.
+import catalyst.types.StringType
+import catalyst.types.BooleanType
+import catalyst.trees.TreeNode
+
+import catalyst.errors.`package`.TreeNodeException
+import org.apache.spark.sql.catalyst.types.DataType
+
+
+/**
+ * Thrown when an invalid RegEx string is found.
+ */
+class InvalidRegExException[TreeType <: TreeNode[_]](tree: TreeType,
reason: String) extends
+ errors.TreeNodeException(tree, s"$reason", null)
+
+trait StringRegexExpression {
+ self: BinaryExpression =>
+
+ type EvaluatedType = Any
--- End diff --
`EvaluatedType` can be set to `Boolean`.
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