[
https://issues.apache.org/jira/browse/HIVE-25485?focusedWorklogId=651058&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-651058
]
ASF GitHub Bot logged work on HIVE-25485:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 15/Sep/21 12:27
Start Date: 15/Sep/21 12:27
Worklog Time Spent: 10m
Work Description: kasakrisz commented on a change in pull request #2608:
URL: https://github.com/apache/hive/pull/2608#discussion_r709113570
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveTransformSimpleSelectsToInlineTableInUnion.java
##########
@@ -0,0 +1,214 @@
+/*
+ * 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.HashMap;
+import java.util.List;
+import org.apache.calcite.plan.RelOptCluster;
+import org.apache.calcite.plan.RelOptRule;
+import org.apache.calcite.plan.RelOptRuleCall;
+import org.apache.calcite.rel.RelNode;
+import org.apache.calcite.rel.core.Project;
+import org.apache.calcite.rel.type.RelDataType;
+import org.apache.calcite.rel.type.RelRecordType;
+import org.apache.calcite.rex.RexBuilder;
+import org.apache.calcite.rex.RexCall;
+import org.apache.calcite.rex.RexNode;
+import org.apache.calcite.sql.SqlOperator;
+import org.apache.calcite.sql.fun.SqlStdOperatorTable;
+import org.apache.hadoop.hive.ql.metadata.Table;
+import org.apache.hadoop.hive.ql.optimizer.calcite.CalciteSemanticException;
+import org.apache.hadoop.hive.ql.optimizer.calcite.RelOptHiveTable;
+import org.apache.hadoop.hive.ql.optimizer.calcite.TraitsUtil;
+import
org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveTableFunctionScan;
+import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveTableScan;
+import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveUnion;
+import
org.apache.hadoop.hive.ql.optimizer.calcite.translator.SqlFunctionConverter;
+import org.apache.hadoop.hive.ql.parse.SemanticAnalyzer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.collect.ImmutableList;
+
+/**
+ * Transforms SELECTS of literals under UNION ALL into inline table scans.
+ */
Review comment:
Could you please add a simple example?
Also a input and output plan something like
from
```
HiveUnion(all=true)
HiveProject(a=[1])
...
HiveProject(a=[42])
...
```
to
```
HiveProject(a=[$0])
HiveTableScan(table=...)
```
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Issue Time Tracking
-------------------
Worklog Id: (was: 651058)
Time Spent: 40m (was: 0.5h)
> Transform selects of literals under a UNION ALL to inline table scan
> --------------------------------------------------------------------
>
> Key: HIVE-25485
> URL: https://issues.apache.org/jira/browse/HIVE-25485
> Project: Hive
> Issue Type: Improvement
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> {code}
> select 1
> union all
> select 1
> union all
> [...]
> union all
> select 1
> {code}
> results in a very big plan; which will have vertexes proportional to the
> number of union all branch - hence it could be slow to execute it
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