org.apache.comet.shims.ShimFileFormat.scala Maven / Gradle / Ivy

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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.comet.shims

import org.apache.spark.sql.types.{LongType, StructField, StructType}

object ShimFileFormat {

  // TODO: remove after dropping Spark 3.3 support and directly use FileFormat.ROW_INDEX
  val ROW_INDEX = "row_index"

  // A name for a temporary column that holds row indexes computed by the file format reader
  // until they can be placed in the _metadata struct.
  // TODO: remove after dropping Spark 3.3 support and directly use
  //       FileFormat.ROW_INDEX_TEMPORARY_COLUMN_NAME
  val ROW_INDEX_TEMPORARY_COLUMN_NAME: String = s"_tmp_metadata_$ROW_INDEX"

  // TODO: remove after dropping Spark 3.3 support and directly use
  //       RowIndexUtil.findRowIndexColumnIndexInSchema
  def findRowIndexColumnIndexInSchema(sparkSchema: StructType): Int = {
    sparkSchema.fields.zipWithIndex.find { case (field: StructField, _: Int) =>
      field.name == ShimFileFormat.ROW_INDEX_TEMPORARY_COLUMN_NAME
    } match {
      case Some((field: StructField, idx: Int)) =>
        if (field.dataType != LongType) {
          throw new RuntimeException(
            s"${ShimFileFormat.ROW_INDEX_TEMPORARY_COLUMN_NAME} must be of LongType")
        }
        idx
      case _ => -1
    }
  }
}