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From fhueske <...@git.apache.org>
Subject [GitHub] flink pull request: [FLINK-3140] NULL value data layout in Row Ser...
Date Tue, 12 Jan 2016 10:27:22 GMT
Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1465#discussion_r49436263
  
    --- Diff: flink-staging/flink-table/src/main/scala/org/apache/flink/api/table/typeinfo/NullAwareComparator.scala
---
    @@ -0,0 +1,186 @@
    +/*
    + * 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 org.apache.flink.api.common.typeutils.TypeComparator
    +import org.apache.flink.core.memory.{MemorySegment, DataOutputView, DataInputView}
    +
    +/**
    + * Null-aware comparator that wraps a comparator which does not support null references.
    + */
    +class NullAwareComparator[T](
    +    val wrappedComparator: TypeComparator[T],
    +    val order: Boolean)
    +  extends TypeComparator[T] {
    +
    +  // stores the null for reference comparison
    +  private var nullReference = false
    +
    +  override def hash(record: T): Int = {
    +    if (record != null) {
    +      wrappedComparator.hash(record)
    +    }
    +    else {
    +      0
    +    }
    +  }
    +
    + override def getNormalizeKeyLen: Int = {
    +    val len = wrappedComparator.getNormalizeKeyLen
    +    if (len == Integer.MAX_VALUE) {
    +      Integer.MAX_VALUE
    +    }
    +    else {
    +      len + 1 // add one for a null byte
    +    }
    +  }
    +
    +  override def putNormalizedKey(
    +      record: T,
    +      target: MemorySegment,
    +      offset: Int,
    +      numBytes: Int)
    +    : Unit = {
    +    if (numBytes > 0) {
    +      // write a null byte with padding
    +      if (record == null) {
    +        target.putBoolean(offset, false)
    +        // write padding
    +        var j = 0
    +        while (j < numBytes - 1) {
    +          target.put(offset + 1 + j, 0.toByte)
    +          j += 1
    +        }
    +      }
    +      // write a non-null byte with key
    +      else {
    +        target.putBoolean(offset, true)
    +        // write key
    +        wrappedComparator.putNormalizedKey(record, target, offset + 1, numBytes - 1)
    +      }
    +    }
    +  }
    +
    +  override def invertNormalizedKey(): Boolean = wrappedComparator.invertNormalizedKey()
    +
    +  override def supportsSerializationWithKeyNormalization(): Boolean = false
    +
    +  override def writeWithKeyNormalization(record: T, target: DataOutputView): Unit =
    +    throw new UnsupportedOperationException("Normalized keys not supported.")
    --- End diff --
    
    Exception should be changed to something like "Record serialization with leading normalized
keys not supported"


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