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https://issues.apache.org/jira/browse/FLINK-5187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15734111#comment-15734111
]
ASF GitHub Bot commented on FLINK-5187:
---------------------------------------
Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/2968#discussion_r91652189
--- Diff:
flink-core/src/main/java/org/apache/flink/api/java/typeutils/runtime/RowComparator.java
---
@@ -0,0 +1,698 @@
+/*
+ * 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.java.typeutils.runtime;
+
+import org.apache.flink.api.common.typeutils.CompositeTypeComparator;
+import org.apache.flink.api.common.typeutils.TypeComparator;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.java.tuple.Tuple4;
+import org.apache.flink.core.memory.DataInputView;
+import org.apache.flink.core.memory.DataOutputView;
+import org.apache.flink.core.memory.MemorySegment;
+import org.apache.flink.types.KeyFieldOutOfBoundsException;
+import org.apache.flink.types.Row;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import static
org.apache.flink.api.java.typeutils.runtime.NullMaskUtils.readIntoNullMask;
+import static org.apache.flink.util.Preconditions.checkArgument;
+
+/**
+ * Comparator for {@link Row}
+ */
+public class RowComparator extends CompositeTypeComparator<Row> {
+
+ private static final long serialVersionUID = 1L;
+ /** The number of fields of the Row */
+ private final int arity;
+ /** key positions describe which fields are keys in what order */
+ private final int[] keyPositions;
+ /** null-aware comparators for the key fields, in the same order as the
key fields */
+ private final NullAwareComparator<Object>[] comparators;
+ /** serializers to deserialize the first n fields for comparison */
+ private final TypeSerializer<Object>[] serializers;
+ /** auxiliary fields for normalized key support */
+ private final int[] normalizedKeyLengths;
+ private final int numLeadingNormalizableKeys;
+ private final int normalizableKeyPrefixLen;
+ private final boolean invertNormKey;
+
+ // null masks for serialized comparison
+ private final boolean[] nullMask1;
+ private final boolean[] nullMask2;
+
+ // cache for the deserialized key field objects
+ transient private final Object[] deserializedKeyFields1;
+ transient private final Object[] deserializedKeyFields2;
+
+ /**
+ * General constructor for RowComparator.
+ *
+ * @param arity the number of fields of the Row
+ * @param keyPositions key positions describe which fields are keys in
what order
+ * @param comparators non-null-aware comparators for the key fields,
in the same order as
+ * the key fields
+ * @param serializers serializers to deserialize the first n fields
for comparison
+ * @param orders sorting orders for the fields
+ */
+ public RowComparator(
+ int arity,
+ int[] keyPositions,
+ TypeComparator<Object>[] comparators,
+ TypeSerializer<Object>[] serializers,
+ boolean[] orders) {
+ this(arity, keyPositions, makeNullAware(comparators, orders),
serializers);
+ }
+
+
+ /**
+ * Intermediate constructor for creating auxiliary fields.
+ */
+ private RowComparator(
+ int arity,
+ int[] keyPositions,
+ NullAwareComparator<Object>[] comparators,
+ TypeSerializer<Object>[] serializers) {
+ this(
+ arity,
+ keyPositions,
+ comparators,
+ serializers,
+ createAuxiliaryFields(keyPositions, comparators));
+ }
+
+ /**
+ * Intermediate constructor for creating auxiliary fields.
+ */
+ private RowComparator(
+ int arity,
+ int[] keyPositions,
+ NullAwareComparator<Object>[] comparators,
+ TypeSerializer<Object>[] serializers,
+ Tuple4<int[], Integer, Integer, Boolean> auxiliaryFields) {
+ this(
+ arity,
+ keyPositions,
+ comparators,
+ serializers,
+ auxiliaryFields.f0,
+ auxiliaryFields.f1,
+ auxiliaryFields.f2,
+ auxiliaryFields.f3);
+ }
+
+ /**
+ * Intermediate constructor for creating auxiliary fields.
+ */
+ private RowComparator(
--- End diff --
This constructor is used in `duplicate` which I don't want to generate the
Tuple4 again.
> Create analog of Row in core
> ----------------------------
>
> Key: FLINK-5187
> URL: https://issues.apache.org/jira/browse/FLINK-5187
> Project: Flink
> Issue Type: Sub-task
> Components: Core, Table API & SQL
> Reporter: Anton Solovev
> Assignee: Jark Wu
>
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