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

["N Campbell (JIRA)" <ji...@apache.org>]

N Campbell created DRILL-4366:
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             Summary: 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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