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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.execution.columnar
import java.nio.{ByteBuffer, ByteOrder}
import scala.annotation.tailrec
import org.apache.spark.sql.catalyst.expressions.{MutableRow, UnsafeArrayData, UnsafeMapData, UnsafeRow}
import org.apache.spark.sql.execution.columnar.compression.CompressibleColumnAccessor
import org.apache.spark.sql.types._
/**
* An `Iterator` like trait used to extract values from columnar byte buffer. When a value is
* extracted from the buffer, instead of directly returning it, the value is set into some field of
* a [[MutableRow]]. In this way, boxing cost can be avoided by leveraging the setter methods
* for primitive values provided by [[MutableRow]].
*/
private[columnar] trait ColumnAccessor {
initialize()
protected def initialize()
def hasNext: Boolean
def extractTo(row: MutableRow, ordinal: Int)
protected def underlyingBuffer: ByteBuffer
}
private[columnar] abstract class BasicColumnAccessor[JvmType](
protected val buffer: ByteBuffer,
protected val columnType: ColumnType[JvmType])
extends ColumnAccessor {
protected def initialize() {}
override def hasNext: Boolean = buffer.hasRemaining
override def extractTo(row: MutableRow, ordinal: Int): Unit = {
extractSingle(row, ordinal)
}
def extractSingle(row: MutableRow, ordinal: Int): Unit = {
columnType.extract(buffer, row, ordinal)
}
protected def underlyingBuffer = buffer
}
private[columnar] class NullColumnAccessor(buffer: ByteBuffer)
extends BasicColumnAccessor[Any](buffer, NULL)
with NullableColumnAccessor
private[columnar] abstract class NativeColumnAccessor[T <: AtomicType](
override protected val buffer: ByteBuffer,
override protected val columnType: NativeColumnType[T])
extends BasicColumnAccessor(buffer, columnType)
with NullableColumnAccessor
with CompressibleColumnAccessor[T]
private[columnar] class BooleanColumnAccessor(buffer: ByteBuffer)
extends NativeColumnAccessor(buffer, BOOLEAN)
private[columnar] class ByteColumnAccessor(buffer: ByteBuffer)
extends NativeColumnAccessor(buffer, BYTE)
private[columnar] class ShortColumnAccessor(buffer: ByteBuffer)
extends NativeColumnAccessor(buffer, SHORT)
private[columnar] class IntColumnAccessor(buffer: ByteBuffer)
extends NativeColumnAccessor(buffer, INT)
private[columnar] class LongColumnAccessor(buffer: ByteBuffer)
extends NativeColumnAccessor(buffer, LONG)
private[columnar] class FloatColumnAccessor(buffer: ByteBuffer)
extends NativeColumnAccessor(buffer, FLOAT)
private[columnar] class DoubleColumnAccessor(buffer: ByteBuffer)
extends NativeColumnAccessor(buffer, DOUBLE)
private[columnar] class StringColumnAccessor(buffer: ByteBuffer)
extends NativeColumnAccessor(buffer, STRING)
private[columnar] class BinaryColumnAccessor(buffer: ByteBuffer)
extends BasicColumnAccessor[Array[Byte]](buffer, BINARY)
with NullableColumnAccessor
private[columnar] class CompactDecimalColumnAccessor(buffer: ByteBuffer, dataType: DecimalType)
extends NativeColumnAccessor(buffer, COMPACT_DECIMAL(dataType))
private[columnar] class DecimalColumnAccessor(buffer: ByteBuffer, dataType: DecimalType)
extends BasicColumnAccessor[Decimal](buffer, LARGE_DECIMAL(dataType))
with NullableColumnAccessor
private[columnar] class StructColumnAccessor(buffer: ByteBuffer, dataType: StructType)
extends BasicColumnAccessor[UnsafeRow](buffer, STRUCT(dataType))
with NullableColumnAccessor
private[columnar] class ArrayColumnAccessor(buffer: ByteBuffer, dataType: ArrayType)
extends BasicColumnAccessor[UnsafeArrayData](buffer, ARRAY(dataType))
with NullableColumnAccessor
private[columnar] class MapColumnAccessor(buffer: ByteBuffer, dataType: MapType)
extends BasicColumnAccessor[UnsafeMapData](buffer, MAP(dataType))
with NullableColumnAccessor
private[columnar] object ColumnAccessor {
@tailrec
def apply(dataType: DataType, buffer: ByteBuffer): ColumnAccessor = {
val buf = buffer.order(ByteOrder.nativeOrder)
dataType match {
case NullType => new NullColumnAccessor(buf)
case BooleanType => new BooleanColumnAccessor(buf)
case ByteType => new ByteColumnAccessor(buf)
case ShortType => new ShortColumnAccessor(buf)
case IntegerType | DateType => new IntColumnAccessor(buf)
case LongType | TimestampType => new LongColumnAccessor(buf)
case FloatType => new FloatColumnAccessor(buf)
case DoubleType => new DoubleColumnAccessor(buf)
case StringType => new StringColumnAccessor(buf)
case BinaryType => new BinaryColumnAccessor(buf)
case dt: DecimalType if dt.precision <= Decimal.MAX_LONG_DIGITS =>
new CompactDecimalColumnAccessor(buf, dt)
case dt: DecimalType => new DecimalColumnAccessor(buf, dt)
case struct: StructType => new StructColumnAccessor(buf, struct)
case array: ArrayType => new ArrayColumnAccessor(buf, array)
case map: MapType => new MapColumnAccessor(buf, map)
case udt: UserDefinedType[_] => ColumnAccessor(udt.sqlType, buffer)
case other =>
throw new Exception(s"not support type: $other")
}
}
}
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