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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