spark RowIndexUtil 源码
spark RowIndexUtil 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/RowIndexUtil.scala
/*
* 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.execution.datasources
import org.apache.spark.sql.types.{LongType, StructField, StructType}
object RowIndexUtil {
def findRowIndexColumnIndexInSchema(sparkSchema: StructType): Int = {
sparkSchema.fields.zipWithIndex.find { case (field: StructField, _: Int) =>
field.name == FileFormat.ROW_INDEX_TEMPORARY_COLUMN_NAME
} match {
case Some((field: StructField, idx: Int)) =>
if (field.dataType != LongType) {
throw new RuntimeException(s"${FileFormat.ROW_INDEX_TEMPORARY_COLUMN_NAME} must be of " +
"LongType")
}
idx
case _ => -1
}
}
def isNeededForSchema(sparkSchema: StructType): Boolean = {
findRowIndexColumnIndexInSchema(sparkSchema) >= 0
}
}
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