[
https://issues.apache.org/jira/browse/HIVE-23434?focusedWorklogId=433692&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-433692
]
ASF GitHub Bot logged work on HIVE-23434:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 15/May/20 13:36
Start Date: 15/May/20 13:36
Worklog Time Spent: 10m
Work Description: kgyrtkirk commented on a change in pull request #1017:
URL: https://github.com/apache/hive/pull/1017#discussion_r425806233
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveRewriteToDataSketchesRule.java
##########
@@ -0,0 +1,327 @@
+/*
+ * 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.hadoop.hive.ql.optimizer.calcite.rules;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+import org.apache.calcite.plan.RelOptRule;
+import org.apache.calcite.plan.RelOptRuleCall;
+import org.apache.calcite.plan.hep.HepRelVertex;
+import org.apache.calcite.rel.RelCollation;
+import org.apache.calcite.rel.RelNode;
+import org.apache.calcite.rel.core.Aggregate;
+import org.apache.calcite.rel.core.AggregateCall;
+import org.apache.calcite.rel.core.Project;
+import org.apache.calcite.rel.core.RelFactories.ProjectFactory;
+import org.apache.calcite.rel.type.RelDataType;
+import org.apache.calcite.rex.RexBuilder;
+import org.apache.calcite.rex.RexNode;
+import org.apache.calcite.sql.SqlAggFunction;
+import org.apache.calcite.sql.SqlOperator;
+import org.apache.calcite.sql.fun.SqlStdOperatorTable;
+import org.apache.calcite.sql.type.SqlTypeName;
+import org.apache.calcite.util.ImmutableBitSet;
+import org.apache.calcite.util.ImmutableBitSet.Builder;
+import org.apache.hadoop.hive.ql.exec.DataSketchesFunctions;
+import org.apache.hadoop.hive.ql.optimizer.calcite.HiveRelFactories;
+import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveAggregate;
+import org.apache.hive.plugin.api.HiveUDFPlugin.UDFDescriptor;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
+
+/**
+ * This rule could rewrite aggregate calls to be calculated using sketch based
functions.
+ *
+ * <br/>
+ * Currently it can rewrite:
+ * <ul>
+ * <li>{@code count(distinct(x))} to distinct counting sketches</li>
+ * <li>{@code percentile_cont(0.2) within group (order by id)}</li>
+ * </ul>
+ *
+ * <p>
+ * The transformation here works on Aggregate nodes; the operations done are
the following:
+ * </p>
+ * <ol>
+ * <li>Identify candidate aggregate calls</li>
+ * <li>A new Project is inserted below the Aggregate; to help with data
pre-processing</li>
+ * <li>A new Aggregate is created in which the aggregation is done by the
sketch function</li>
+ * <li>A new Project is inserted on top of the Aggregate; which unwraps the
resulting
+ * count-distinct estimation from the sketch representation</li>
+ * </ol>
+ */
+public final class HiveRewriteToDataSketchesRule extends RelOptRule {
+
+ protected static final Logger LOG =
LoggerFactory.getLogger(HiveRewriteToDataSketchesRule.class);
+ private final Optional<String> countDistinctSketchType;
+ private final Optional<String> percentileContSketchType;
+ private final ProjectFactory projectFactory;
+
+ public HiveRewriteToDataSketchesRule(Optional<String>
countDistinctSketchType,
+ Optional<String> percentileContSketchType) {
+ super(operand(HiveAggregate.class, any()));
+ this.countDistinctSketchType = countDistinctSketchType;
+ this.percentileContSketchType = percentileContSketchType;
+ projectFactory = HiveRelFactories.HIVE_PROJECT_FACTORY;
+ }
+
+ @Override
+ public void onMatch(RelOptRuleCall call) {
+ final Aggregate aggregate = call.rel(0);
+
+ if (aggregate.getGroupSets().size() != 1) {
+ // not yet supported
+ return;
+ }
+
+ List<AggregateCall> newAggCalls = new ArrayList<AggregateCall>();
+
+ VBuilder vb = new VBuilder(aggregate);
+
+ if (aggregate.getAggCallList().equals(vb.newAggCalls)) {
+ // rule didn't made any changes
+ return;
+ }
+
+ newAggCalls = vb.newAggCalls;
+ List<String> filedNames=new ArrayList<String>();
Review comment:
I didn't even noticed this :)
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Issue Time Tracking
-------------------
Worklog Id: (was: 433692)
Time Spent: 40m (was: 0.5h)
> Add option to rewrite PERCENTILE_CONT to sketch functions
> ---------------------------------------------------------
>
> Key: HIVE-23434
> URL: https://issues.apache.org/jira/browse/HIVE-23434
> Project: Hive
> Issue Type: Sub-task
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-23434.01.patch, HIVE-23434.02.patch,
> HIVE-23434.03.patch
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
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