Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/13964#discussion_r68929933 --- 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. --- End diff -- nit: we should say it more explicitly: `If the path is a constant, cache the path string so that we don't need to convert path from UTF8String to String for every row`
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