[
https://issues.apache.org/jira/browse/HIVE-23031?focusedWorklogId=426882&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-426882
]
ASF GitHub Bot logged work on HIVE-23031:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 24/Apr/20 07:40
Start Date: 24/Apr/20 07:40
Worklog Time Spent: 10m
Work Description: kgyrtkirk commented on a change in pull request #988:
URL: https://github.com/apache/hive/pull/988#discussion_r414363412
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveRewriteCountDistinctToDataSketches.java
##########
@@ -0,0 +1,175 @@
+/*
+ * 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 org.apache.calcite.plan.RelOptRule;
+import org.apache.calcite.plan.RelOptRuleCall;
+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.RelFactories.AggregateFactory;
+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.hadoop.hive.conf.HiveConf;
+import org.apache.hadoop.hive.conf.HiveConf.ConfVars;
+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;
+
+/**
+ * This rule could rewrite {@code count(distinct(x))} calls to be calculated
using sketch based functions.
+ */
+public final class HiveRewriteCountDistinctToDataSketches extends RelOptRule {
+
+ protected static final Logger LOG =
LoggerFactory.getLogger(HiveRewriteCountDistinctToDataSketches.class);
+ private String sketchClass;
+
+ public HiveRewriteCountDistinctToDataSketches(HiveConf conf) {
+ super(operand(HiveAggregate.class, any()));
+ sketchClass =
conf.getVar(ConfVars.HIVE_OPTIMIZE_REWRITE_COUNT_DISTINCT_SKETCHCLASS);
+ }
+
+ @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>();
+
+ AggregateFactory f = HiveRelFactories.HIVE_AGGREGATE_FACTORY;
Review comment:
I just followed the "usual practice" by passing the `HiveConf` :D
but since there is nothing else needed - I've removed it...
About the factory stuff: I've moved it to the constructor/etc
but this is not entirely clear to me:
* we the `HiveRelFactories` - to construct things
* in the meantime there is also `call.builder()` which could be probably
could be used to do the same
Other rules seemed to utilize `HiveRelFactories` so I've followed that - but
I feel that it would be better to use the builder - and fix the issues we might
encounter along the way...what do you think?
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Issue Time Tracking
-------------------
Worklog Id: (was: 426882)
Time Spent: 40m (was: 0.5h)
> Add option to enable transparent rewrite of count(distinct) into sketch
> functions
> ---------------------------------------------------------------------------------
>
> Key: HIVE-23031
> URL: https://issues.apache.org/jira/browse/HIVE-23031
> Project: Hive
> Issue Type: Sub-task
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Attachments: HIVE-23031.01.patch, HIVE-23031.02.patch,
> HIVE-23031.03.patch, HIVE-23031.03.patch, HIVE-23031.03.patch
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
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