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https://issues.apache.org/jira/browse/HIVE-26524?focusedWorklogId=811178&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-811178
]
ASF GitHub Bot logged work on HIVE-26524:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 22/Sep/22 11:49
Start Date: 22/Sep/22 11:49
Worklog Time Spent: 10m
Work Description: kasakrisz commented on code in PR #3588:
URL: https://github.com/apache/hive/pull/3588#discussion_r977556946
##########
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/reloperators/HiveValues.java:
##########
@@ -0,0 +1,53 @@
+/*
+ * 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.reloperators;
+
+import com.google.common.collect.ImmutableList;
+import org.apache.calcite.plan.RelOptCluster;
+import org.apache.calcite.plan.RelTraitSet;
+import org.apache.calcite.rel.RelNode;
+import org.apache.calcite.rel.core.Values;
+import org.apache.calcite.rel.type.RelDataType;
+import org.apache.calcite.rex.RexLiteral;
+
+import java.util.List;
+
+/**
+ * Subclass of {@link org.apache.calcite.rel.core.Values}.
+ * Specialized to Hive engine.
+ */
+public class HiveValues extends Values {
+
+ public HiveValues(
+ RelOptCluster cluster,
+ RelDataType rowType,
+ ImmutableList<ImmutableList<RexLiteral>> tuples,
+ RelTraitSet traits) {
Review Comment:
A single line constructor head definition would be more than 120 character.
I know than there is no rule to enforce this limit but this was used before
we switched to PR and I still try to follow this rule.
(I experienced that Calcite has a 100 char limitation.)
So I defined this in two lines like we did it in case of HiveProject.
Issue Time Tracking
-------------------
Worklog Id: (was: 811178)
Time Spent: 1h 40m (was: 1.5h)
> Use Calcite to remove sections of a query plan known never produces rows
> ------------------------------------------------------------------------
>
> Key: HIVE-26524
> URL: https://issues.apache.org/jira/browse/HIVE-26524
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Reporter: Krisztian Kasa
> Assignee: Krisztian Kasa
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> Calcite has a set of rules to remove sections of a query plan known never
> produces any rows. In some cases the whole plan can be removed. Such plans
> are represented with a single {{Values}} operators with no tuples. ex.:
> {code:java}
> select y + 1 from (select a1 y, b1 z from t1 where b1 > 10) q WHERE 1=0
> {code}
> {code:java}
> HiveValues(tuples=[[]])
> {code}
> Other cases when plan has outer join or set operators some branches can be
> replaced with empty values moving forward in some cases the join/set operator
> can be removed
> {code:java}
> select a2, b2 from t2 where 1=0
> union
> select a1, b1 from t1
> {code}
> {code:java}
> HiveAggregate(group=[{0, 1}])
> HiveTableScan(table=[[default, t1]], table:alias=[t1])
> {code}
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