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/*
* 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.SqlNewHadoopRDDState
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.expressions.codegen.{CodegenContext, ExprCode}
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]]
*/
@ExpressionDescription(
usage = "_FUNC_() - Returns the name of the current file being read if available",
extended = "> SELECT _FUNC_();\n ''")
case class InputFileName() extends LeafExpression with Nondeterministic {
override def nullable: Boolean = true
override def dataType: DataType = StringType
override def prettyName: String = "input_file_name"
override protected def initInternal(): Unit = {}
override protected def evalInternal(input: InternalRow): UTF8String = {
SqlNewHadoopRDDState.getInputFileName()
}
override def genCode(ctx: CodegenContext, ev: ExprCode): String = {
ev.isNull = "false"
s"final ${ctx.javaType(dataType)} ${ev.value} = " +
"org.apache.spark.rdd.SqlNewHadoopRDDState.getInputFileName();"
}
}
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