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https://issues.apache.org/jira/browse/DRILL-7096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16914395#comment-16914395
]
ASF GitHub Bot commented on DRILL-7096:
---------------------------------------
vvysotskyi commented on pull request #1829: DRILL-7096: Develop vector for
canonical Map<K,V>
URL: https://github.com/apache/drill/pull/1829#discussion_r317181670
##########
File path:
exec/java-exec/src/test/java/org/apache/drill/exec/record/vector/TestDictVector.java
##########
@@ -0,0 +1,460 @@
+/*
+ * 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.drill.exec.record.vector;
+
+import io.netty.buffer.DrillBuf;
+import org.apache.drill.categories.VectorTest;
+import org.apache.drill.common.config.DrillConfig;
+import org.apache.drill.common.exceptions.DrillRuntimeException;
+import org.apache.drill.exec.ExecTest;
+import org.apache.drill.exec.expr.holders.NullableBigIntHolder;
+import org.apache.drill.exec.memory.BufferAllocator;
+import org.apache.drill.exec.memory.RootAllocatorFactory;
+import org.apache.drill.exec.proto.UserBitShared;
+import org.apache.drill.exec.record.MaterializedField;
+import org.apache.drill.exec.record.RecordBatchLoader;
+import org.apache.drill.exec.record.TransferPair;
+import org.apache.drill.exec.record.WritableBatch;
+import org.apache.drill.exec.vector.complex.DictVector;
+import org.apache.drill.exec.vector.complex.impl.SingleDictWriter;
+import org.apache.drill.exec.vector.complex.reader.BaseReader;
+import org.apache.drill.exec.vector.complex.writer.BaseWriter;
+import org.apache.drill.test.TestBuilder;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+import org.junit.rules.ExpectedException;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.junit.Assert.assertEquals;
+
+@Category(VectorTest.class)
+public class TestDictVector extends ExecTest {
+
+ @Rule
+ public ExpectedException thrown = ExpectedException.none();
+
+ private BufferAllocator allocator;
+
+ @Before
+ public void setUp() {
+ allocator = RootAllocatorFactory.newRoot(DrillConfig.create());
+ }
+
+ @After
+ public void tearDown(){
+ allocator.close();
+ }
+
+ @Test
+ public void testVectorCreation() {
+ MaterializedField field = MaterializedField.create("map", DictVector.TYPE);
+ try (DictVector mapVector = new DictVector(field, allocator, null)) {
+ mapVector.allocateNew();
+
+ List<Map<Object, Object>> maps = Arrays.asList(
+ TestBuilder.mapOfObject(4f, 1L, 5.3f, 2L, 0.3f, 3L, -0.2f, 4L,
102.07f, 5L),
Review comment:
Please rework these tests to use generics if possible.
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> Develop vector for canonical Map<K,V>
> -------------------------------------
>
> Key: DRILL-7096
> URL: https://issues.apache.org/jira/browse/DRILL-7096
> Project: Apache Drill
> Issue Type: Sub-task
> Reporter: Igor Guzenko
> Assignee: Bohdan Kazydub
> Priority: Major
> Fix For: 1.17.0
>
>
> Canonical Map<K,V> datatype can be represented using combination of three
> value vectors:
> keysVector - vector for storing keys of each map
> valuesVector - vector for storing values of each map
> offsetsVector - vector for storing of start indexes of next each map
> So it's not very hard to create such Map vector, but there is a major issue
> with such map representation. It's hard to search maps values by key in such
> vector, need to investigate some advanced techniques to make such search
> efficient. Or find other more suitable options to represent map datatype in
> world of vectors.
> After question about maps, Apache Arrow developers responded that for Java
> they don't have real Map vector, for now they just have logical Map type
> definition where they define Map like: List< Struct<key:key_type,
> value:value_type> >. So implementation of value vector would be useful for
> Arrow too.
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