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https://issues.apache.org/jira/browse/TRAFODION-2576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15957383#comment-15957383
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ASF GitHub Bot commented on TRAFODION-2576:
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GitHub user DaveBirdsall opened a pull request:
https://github.com/apache/incubator-trafodion/pull/1046
[TRAFODION-2576] Fix long varchar bug in incremental UPDATE STATISTICS
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/DaveBirdsall/incubator-trafodion Trafodion2376
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-trafodion/pull/1046.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1046
----
commit ebf98de2ba8ffd361773df3e42b8813b98ce6691
Author: Dave Birdsall <[email protected]>
Date: 2017-04-05T18:23:38Z
[TRAFODION-2576] Fix long varchar bug in incremental UPDATE STATISTICS
----
> Incremental UPDATE STATS fails on long varchar values
> -----------------------------------------------------
>
> Key: TRAFODION-2576
> URL: https://issues.apache.org/jira/browse/TRAFODION-2576
> Project: Apache Trafodion
> Issue Type: Bug
> Components: sql-cmp
> Environment: All
> Reporter: David Wayne Birdsall
> Assignee: David Wayne Birdsall
>
> The following test script demonstrates the problem:
> -- This script creates a table with varchar values longer than 256 characters.
> -- It tnen demonstrates issues with incremental stats on such values.
> ?section setup
> drop table if exists testbigcol;
> create table testbigcol
> ( a int not null,
> b varchar(500),
> primary key (a) )
> salt using 4 partitions;
> insert into testbigcol values (1,'axq'),(2,'bxw');
> insert into testbigcol select x.a + 2 * y.a, x.b || y.b from testbigcol x
> cross join testbigcol y;
> insert into testbigcol select x.a + 6 * y.a, x.b || y.b from testbigcol x
> cross join testbigcol y;
> insert into testbigcol select x.a + 42 * y.a, x.b || y.b from testbigcol x
> cross join testbigcol y;
> -- 0 1 2 3 4
> 5
> --
> 012345678901234567890123456789012345678901234567890123
> update testbigcol set b = b || ' and now for something completely different
> 0123456789'
> where mod(a,2) = 1;
> update testbigcol set b = b || ' that was fun, and now for something
> completely different 0123456789'
> where mod(a,3) = 1;
> update testbigcol set b = b || ' and then there was a great hue and cry and
> now for something completely different 0123456789'
> where mod(a,5) = 1;
> update testbigcol set b = b || ' and we can do all sorts of things to make
> these strings longer, and now for something completely different 0123456789'
> where mod(a,7) = 1;
> ?section testit
> update statistics for table testbigcol on every column sample random 100
> percent persistent;
> showstats for table testbigcol on existing columns detail;
> update testbigcol set b = 'c' || b where a > 1700;
> update statistics for table testbigcol on existing columns incremental where
> a > 1700;
> showstats for table testbigcol on existing columns detail;
> When run, the last UPDATE STATISTICS command fails as follows:
> >>update statistics for table testbigcol on existing columns incremental
> >>where a > 1700;
> *** ERROR[9200] UPDATE STATISTICS for table TRAFODION.SEABASE.TESTBIGCOL
> encountered an error (8402) from statement IUS data set I creation.
> *** ERROR[8402] A string overflow occurred during the evaluation of a
> character expression. Conversion of Source Type:VARCHAR(REC_BYTE_V_ASCII,290
> BYTES,ISO88591) Source Value:caxqbxwbxwaxqaxqbxwbxwbxw and now for something
> completely different 0123456789 and then there was a great hue and cry and
> now for something completely different 0123456789 and we can do all sorts of
> to Target Type:VARCHAR(REC_BYTE_V_ASCII,256 BYTES,ISO88591).
> --- SQL operation failed with errors.
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