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From tillrohrmann <...@git.apache.org>
Subject [GitHub] flink pull request: [FLINK-3140] NULL value data layout in Row Ser...
Date Thu, 17 Dec 2015 13:13:30 GMT
Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1465#discussion_r47903444
  
    --- Diff: flink-staging/flink-table/src/main/scala/org/apache/flink/api/table/typeinfo/RowComparator.scala
---
    @@ -0,0 +1,468 @@
    +/*
    + * 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.flink.api.table.typeinfo
    +
    +import java.util
    +
    +import org.apache.flink.api.common.typeutils.base.BasicTypeComparator
    +import org.apache.flink.api.common.typeutils.{CompositeTypeComparator, TypeComparator,
TypeSerializer}
    +import org.apache.flink.api.java.typeutils.runtime.TupleComparatorBase
    +import org.apache.flink.api.table.Row
    +import org.apache.flink.api.table.typeinfo.NullMaskUtils.readIntoNullMask
    +import org.apache.flink.api.table.typeinfo.RowComparator.NullChecker
    +import org.apache.flink.core.memory.{MemorySegment, DataOutputView, DataInputView}
    +import org.apache.flink.types.{KeyFieldOutOfBoundsException, NullKeyFieldException}
    +
    +/**
    + * Comparator for [[Row]].
    + */
    +class RowComparator private (
    +    /** key positions describe which fields are keys in what order */
    +    val keyPositions: Array[Int],
    +    /** comparators for the key fields, in the same order as the key fields */
    +    val comparators: Array[TypeComparator[_]],
    +    /** serializers to deserialize the first n fields for comparison */
    +    val serializers: Array[TypeSerializer[_]],
    +    /** auxiliary fields for normalized key support */
    +    private var normalizedKeyLengths: Array[Int],
    +    private var numLeadingNormalizableKeys: Int,
    +    private var normalizableKeyPrefixLen: Int,
    +    private var invertNormKey: Boolean)
    +  extends CompositeTypeComparator[Row] with Serializable {
    +
    +  // null masks for serialized comparison
    +  private val nullMask1 = new Array[Boolean](serializers.length)
    +  private val nullMask2 = new Array[Boolean](serializers.length)
    +
    +  // cache for the deserialized key field objects
    +  @transient
    +  private var deserializedKeyFields1: Array[Any] = null
    +  @transient
    +  private var deserializedKeyFields2: Array[Any] = null
    +
    +  // null checker for reference comparison
    +  private val nullChecker = new NullChecker()
    +
    +  def this(
    +      keyPositions: Array[Int],
    +      comparators: Array[TypeComparator[_]],
    +      serializers: Array[TypeSerializer[_]]) = {
    +    this(keyPositions, comparators, serializers, new Array[Int](keyPositions.length),
0, 0, false)
    +    // set up auxiliary fields for normalized key support
    +    setupAuxiliaryFields()
    --- End diff --
    
    Can't we simply let `setupAuxiliaryFields` return the `normalizedKeyLengths`, `numLeadingNormalizableKeys`
and `normalizableKeyPrefixLen` values for the constructor call? Maybe we should then rename
the method to `createAuxiliaryFields`.


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