[jira] [Created] (DRILL-7195) Query returns incorrect result or does not fail when cast with is null is used in filter condition

["Volodymyr Vysotskyi (JIRA)" <ji...@apache.org>]

Volodymyr Vysotskyi created DRILL-7195:
------------------------------------------

             Summary: Query returns incorrect result or does not fail when cast with is null is used in filter condition
                 Key: DRILL-7195
                 URL: https://issues.apache.org/jira/browse/DRILL-7195
             Project: Apache Drill
          Issue Type: Bug
    Affects Versions: 1.16.0
            Reporter: Volodymyr Vysotskyi
             Fix For: 1.16.0


1. For the case when a query contains filter with a {{cast}} which cannot be done with {{is null}}, the query does not fail:
{code:sql}
select * from dfs.tmp.`a.json` as t where cast(t.a as integer) is null;
+---+
| a |
+---+
+---+
No rows selected (0.142 seconds)
{code}
where
{noformat}
cat /tmp/a.json
{"a":"aaa"}
{noformat}
But for the case when this condition is specified in project, query, as it is expected, fails:
{code:sql}
select cast(t.a as integer) is null from dfs.tmp.`a.json` t;
Error: SYSTEM ERROR: NumberFormatException: aaa

Fragment 0:0

Please, refer to logs for more information.

[Error Id: ed3982ce-a12f-4d63-bc6e-cafddf28cc24 on user515050-pc:31010] (state=,code=0)
{code}
This is a regression, for Drill 1.15 the first and the second queries are failed:
{code:sql}
select * from dfs.tmp.`a.json` as t where cast(t.a as integer) is null;
Error: SYSTEM ERROR: NumberFormatException: aaa

Fragment 0:0

Please, refer to logs for more information.

[Error Id: 2f878f15-ddaa-48cd-9dfb-45c04db39048 on user515050-pc:31010] (state=,code=0)
{code}
2. For the case when {{drill.exec.functions.cast_empty_string_to_null}} is enabled, this issue will cause wrong results:
{code:sql}
alter system set `drill.exec.functions.cast_empty_string_to_null`=true;

select * from dfs.tmp.`a1.json` t where cast(t.a as integer) is null;
+---+
| a |
+---+
+---+
No rows selected (1.759 seconds)
{code}
where
{noformat}
cat /tmp/a1.json 
{"a":"1"}
{"a":""}
{noformat}
Result for Drill 1.15.0:
{code:sql}
select * from dfs.tmp.`a1.json` t where cast(t.a as integer) is null;
+----+
| a  |
+----+
|    |
+----+
1 row selected (1.724 seconds)
{code}



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