[jira] [Work logged] (BEAM-7049) Merge multiple input to one BeamUnionRel

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-7049?focusedWorklogId=312284&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-312284 ]

ASF GitHub Bot logged work on BEAM-7049:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 13/Sep/19 19:34
            Start Date: 13/Sep/19 19:34
    Worklog Time Spent: 10m 
      Work Description: amaliujia commented on pull request #9358: (WIP-BEAM-7049)Changes made to make a simple case of threeway union work
URL: https://github.com/apache/beam/pull/9358#discussion_r324338919
 
 

 ##########
 File path: sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/planner/BeamRuleSets.java
 ##########
 @@ -141,6 +142,7 @@
 
   private static final List<RelOptRule> BEAM_CONVERTERS =
       ImmutableList.of(
+          UnionMergeRule.INSTANCE, //Added for three way union
 
 Review comment:
   Ah. The only difference of us might just be the place to add this rule:
   
   I added to LOGICAL_OPTIMIZATIONS above.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 312284)
    Time Spent: 0.5h  (was: 20m)

> Merge multiple input to one BeamUnionRel
> ----------------------------------------
>
>                 Key: BEAM-7049
>                 URL: https://issues.apache.org/jira/browse/BEAM-7049
>             Project: Beam
>          Issue Type: Improvement
>          Components: dsl-sql
>            Reporter: Rui Wang
>            Assignee: sridhar Reddy
>            Priority: Major
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> BeamUnionRel assumes inputs are two and rejects more. So `a UNION b UNION c` will have to be created as UNION(a, UNION(b, c)) and have two shuffles. If BeamUnionRel can handle multiple shuffles, we will have only one shuffle



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