[jira] [Commented] (CARBONDATA-2819) cannot drop preagg datamap on table if the table has other index datamaps

["Jacky Li (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CARBONDATA-2819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16581850#comment-16581850 ] 

Jacky Li commented on CARBONDATA-2819:
--------------------------------------

Currently preagg schema is not written into _system folder, so when dropping datamap the logic in CarbonDropDataMapCommand maybe wrong. 
I think for this issue, we can modify CarbonDropDataMapCommand in a simple way, but for long run, we need to consider whether to put preagg datamap also into _system folder

> cannot drop preagg datamap on table if the table has other index datamaps
> -------------------------------------------------------------------------
>
>                 Key: CARBONDATA-2819
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-2819
>             Project: CarbonData
>          Issue Type: Improvement
>    Affects Versions: 1.4.1
>            Reporter: lianganping
>            Priority: Major
>          Time Spent: 7h 10m
>  Remaining Estimate: 0h
>
> 1.create table student_test(id int,name string,class_number int,male int,female int) stored by 'carbondata';
> 2.create datamap dm1_preaggr_student_test ON TABLE student_test USING 'preaggregate' as select class_number,sum(male) from student_test group by class_number
> 3.create datamap dm_lucene_student_test on table student_test using 'lucene' dmproperties('index_columns' = 'name');
> 4.drop datamap dm1_preaggr_student_test on table student_test;
> and will get this error:
> Error: org.apache.carbondata.common.exceptions.sql.NoSuchDataMapException: Datamap with name dm1_preaggr_student_test does not exist (state=,code=0)



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