Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/14562#discussion_r74187449 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/slicedRows.scala --- @@ -0,0 +1,108 @@ +/* + * 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.sql.catalyst.InternalRow +import org.apache.spark.sql.catalyst.util.{ArrayData, MapData} +import org.apache.spark.sql.types.{DataType, Decimal} +import org.apache.spark.unsafe.types.{CalendarInterval, UTF8String} + +/** + * A sliced row provides a view of the underlying row, and forwards all read/write requests to the + * underlying row, after shifting the index by offset. + * + * Note that, the underlying row field in this class is mutable, so that we can reuse the same + * instance of this class while processing many rows. + */ +trait BaseSlicedInternalRow extends InternalRow { + def baseRow: InternalRow + def offset: Int + + protected def toBaseIndex(index: Int): Int = { + assert(index >= 0, "index (" + index + ") should >= 0") + assert(index < numFields, "index (" + index + ") should < " + numFields) + index + offset + } + + override def isNullAt(i: Int): Boolean = baseRow.isNullAt(toBaseIndex(i)) + override def getBoolean(i: Int): Boolean = baseRow.getBoolean(toBaseIndex(i)) + override def getByte(i: Int): Byte = baseRow.getByte(toBaseIndex(i)) + override def getShort(i: Int): Short = baseRow.getShort(toBaseIndex(i)) + override def getInt(i: Int): Int = baseRow.getInt(toBaseIndex(i)) + override def getLong(i: Int): Long = baseRow.getLong(toBaseIndex(i)) + override def getFloat(i: Int): Float = baseRow.getFloat(toBaseIndex(i)) + override def getDouble(i: Int): Double = baseRow.getDouble(toBaseIndex((i))) + override def getDecimal(i: Int, precision: Int, scale: Int): Decimal = + baseRow.getDecimal(toBaseIndex(i), precision, scale) + override def getUTF8String(i: Int): UTF8String = baseRow.getUTF8String(toBaseIndex(i)) + override def getBinary(i: Int): Array[Byte] = baseRow.getBinary(toBaseIndex(i)) + override def getInterval(i: Int): CalendarInterval = baseRow.getInterval(toBaseIndex(i)) + override def getStruct(i: Int, numFields: Int): InternalRow = + baseRow.getStruct(toBaseIndex(i), numFields) + override def getArray(i: Int): ArrayData = baseRow.getArray(toBaseIndex(i)) + override def getMap(i: Int): MapData = baseRow.getMap(toBaseIndex(i)) + override def get(i: Int, dataType: DataType): AnyRef = baseRow.get(toBaseIndex(i), dataType) + + override def anyNull: Boolean = { + val len = offset + numFields + var i = offset + while (i < len) { + if (isNullAt(i)) { return true } + i += 1 + } + false + } + + override def copy(): InternalRow = { + throw new UnsupportedOperationException("Cannot copy a SlicedMutableRow") + } +} + +case class SlicedInternalRow(offset: Int, numFields: Int) extends BaseSlicedInternalRow { --- End diff -- It generates a lot of crap in bytecode, so would be good to not generate them unless they are useful.
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