[jira] [Commented] (DRILL-4366) case expression referencing columns[..] = literal fails to resolve to tru

["Jacques Nadeau (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15136433#comment-15136433 ] 

Jacques Nadeau commented on DRILL-4366:
---------------------------------------

Can you confirm that the length that Drill detects for each value is 1 by running LENGTH(columns[1])?


> case expression referencing columns[..] = literal fails to resolve to tru
> -------------------------------------------------------------------------
>
>                 Key: DRILL-4366
>                 URL: https://issues.apache.org/jira/browse/DRILL-4366
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: SQL Parser
>    Affects Versions: 1.4.0
>            Reporter: N Campbell
>
> A file (i.e PSV) has one or more columns with the string literal \N. A query that projects a conditional value based on testing the columns[N] being equal never results in true. Meanwhile comparing the same literal to the result of  a substring applied to the same column works. 
> SELECT columns[0] as RNUM, columns[1], case when substr(columns[1],1,2)= '\N' then 1 else 0 end ,case when columns[1]='\N' then 1 else 0 end  FROM `dfs`.`TEXT`.`./TBINT.tbl` LIMIT 100
> input file TBINT.tbl
> 0|\N
> 1|-1
> 2|0
> 3|1
> 4|10



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