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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (HIVE-23434) Add option to rewrite PERCENTILE_CONT to sketch functions
Date Fri, 15 May 2020 13:37:00 GMT

     [ 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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