Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7743#discussion_r35732412
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/InputFileName.scala
---
@@ -0,0 +1,51 @@
+/*
+ * 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
+
+import org.apache.spark.rdd.SqlNewHadoopRDD
+import org.apache.spark.sql.catalyst.InternalRow
+import
org.apache.spark.sql.catalyst.expressions.codegen.{GeneratedExpressionCode,
CodeGenContext}
+import org.apache.spark.sql.types.{DataType, StringType}
+import org.apache.spark.unsafe.types.UTF8String
+
+/**
+ * Expression that returns the name of the current file being read in
using [[SqlNewHadoopRDD]]
+ */
+case class InputFileName() extends LeafExpression with Nondeterministic {
+
+ override def nullable: Boolean = true
+
+ override def dataType: DataType = StringType
+
+ override val prettyName = "INPUT_FILE_NAME"
+
+ override protected def initInternal(): Unit = {}
+
+ override protected def evalInternal(input: InternalRow): UTF8String = {
+ SqlNewHadoopRDD.getInputFileName()
+ }
+
+ override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
+ val nameTerm = ctx.freshName("fileName")
+ ctx.addMutableState(ctx.javaType(StringType), nameTerm,
+ s"$nameTerm =
org.apache.spark.rdd.SqlNewHadoopRDD.getInputFileName();")
--- End diff --
this also shouldn't be a mutable state
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