Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13964#discussion_r68886279
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/xml/XPathBoolean.scala
---
@@ -0,0 +1,56 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.catalyst.expressions.xml
+
+import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.catalyst.expressions.codegen.CodegenFallback
+import org.apache.spark.sql.types.{AbstractDataType, BooleanType,
DataType, StringType}
+import org.apache.spark.unsafe.types.UTF8String
+
+
+@ExpressionDescription(
+ usage = "_FUNC_(xml, xpath) - Evaluates a boolean xpath expression.",
+ extended = "> SELECT _FUNC_('<a><b>1</b></a>','a/b');\ntrue")
+case class XPathBoolean(xml: Expression, path: Expression)
+ extends BinaryExpression with ExpectsInputTypes with CodegenFallback {
+
+ @transient private lazy val xpathUtil = new UDFXPathUtil
+
+ // We use these to avoid converting the path from UTF8String to String
if it is a constant.
+ @transient private var lastPathUtf8: UTF8String = null
--- End diff --
how about
```
@transient lazy val pathLiteral: String = path match {
case Literal(str: String) => str
case _ => null
}
```
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