spark CompressibleColumnAccessor 源码
spark CompressibleColumnAccessor 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/compression/CompressibleColumnAccessor.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.columnar.compression
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.execution.columnar.{ColumnAccessor, NativeColumnAccessor}
import org.apache.spark.sql.execution.vectorized.WritableColumnVector
import org.apache.spark.sql.types.AtomicType
private[columnar] trait CompressibleColumnAccessor[T <: AtomicType] extends ColumnAccessor {
this: NativeColumnAccessor[T] =>
private var decoder: Decoder[T] = _
abstract override protected def initialize(): Unit = {
super.initialize()
decoder = CompressionScheme(underlyingBuffer.getInt()).decoder(buffer, columnType)
}
abstract override def hasNext: Boolean = super.hasNext || decoder.hasNext
override def extractSingle(row: InternalRow, ordinal: Int): Unit = {
decoder.next(row, ordinal)
}
def decompress(columnVector: WritableColumnVector, capacity: Int): Unit =
decoder.decompress(columnVector, capacity)
}
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