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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Work logged] (BEAM-5074) Make BeamSqlRowComparator more general
Date Sat, 04 Aug 2018 06:55:00 GMT

     [ https://issues.apache.org/jira/browse/BEAM-5074?focusedWorklogId=131177&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-131177
]

ASF GitHub Bot logged work on BEAM-5074:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 04/Aug/18 06:54
            Start Date: 04/Aug/18 06:54
    Worklog Time Spent: 10m 
      Work Description: amaliujia opened a new pull request #6145: [BEAM-5074][SQL] improve
BeamSqlRowComparator
URL: https://github.com/apache/beam/pull/6145
 
 
   Refactoring BeamSqlRowComparator a bit to make it can return comparison results in either
natural order or reversed order.
   
   In the past, BeamSqlRowComparator only returned comparison results in reversed order. It
was because BeamSortRel only supports `ORDER BY LIMIT` by using `Top` (`Top` by default returns
elements in descending order). For example, if there is a query `SELECT * FROM table ORDER
BY id ASC LIMIT 1`,  and assuming there are two rows in table with id `1` and `2` separately,
in order to return the right result by using `Top`,  `BeamSqlRowComparator` have to tell `Top`
that the row with id `1` is bigger (which means comparator returns in reversed order).
   
   
   In order to support `ORDER BY ASC` and ORDER BY DESC`, there is a need to have a comparator
that returns in natural order (if 1 < 2, then returns -1 to indicate 1 < 2). So in this
PR,  BeamSqlRowComparator is changed to achieve this goal. 
   
   ------------------------
   
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   Post-Commit Tests Status (on master branch)
   ------------------------------------------------------------------------------------------------
   
   Lang | SDK | Apex | Dataflow | Flink | Gearpump | Samza | Spark
   --- | --- | --- | --- | --- | --- | --- | ---
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| [![Build Status](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Samza_Gradle/lastCompletedBuild/badge/icon)](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Samza_Gradle/lastCompletedBuild/)
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Issue Time Tracking
-------------------

            Worklog Id:     (was: 131177)
            Time Spent: 10m
    Remaining Estimate: 0h

> Make BeamSqlRowComparator more general
> --------------------------------------
>
>                 Key: BEAM-5074
>                 URL: https://issues.apache.org/jira/browse/BEAM-5074
>             Project: Beam
>          Issue Type: Improvement
>          Components: dsl-sql
>            Reporter: Rui Wang
>            Assignee: Rui Wang
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> BeamSqlRowComparator returns reversed comparison results (if a < b in terms of value, BeamSqlRowComparator
returns a > b). 
>  
> Add a flag to turn on/off this reversed effect. The reason of doing this is to help implement
ORDER BY ASC/DESC in the normal way.
>  



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