[jira] [Created] (DRILL-6358) Null value returned from WHERE a IS NOT NULL query

[Paul Rogers (JIRA)]

Paul Rogers created DRILL-6358:
----------------------------------

             Summary: Null value returned from WHERE a IS NOT NULL query
                 Key: DRILL-6358
                 URL: https://issues.apache.org/jira/browse/DRILL-6358
             Project: Apache Drill
          Issue Type: Bug
    Affects Versions: 1.13.0
            Reporter: Paul Rogers


Consider the following input file:

{noformat}
{a: null}
{a: 10}
{noformat}

Then run the following. The result is as expected:

{noformat}
SELECT * FROM `json/null-int.json` WHERE a IS NOT NULL;
+-----+
|  a  |
+-----+
| 10  |
+-----+
{noformat}

Now, do something similar. Create a file that repeats the first record 70,000 
times. Call it {{70Knulls.json}}. Run the same query. The results are bizarre:

{noformat}
SELECT * FROM `gen/70Knulls.json` WHERE a IS NOT NULL;
+-------+
|  **   |
+-------+
| null  |
+-------+
{noformat}

The column name of "\*\*" I probably due to DRILL-6357. The query may be 
treating a as a missing column, and fill in the bogus "\*\*" field.

So, there is no column {{a}} in that theory. So, no rows should have matched. 
But, then. column {{a}} finally appeared. Why does it have a null value, not 
10? And, why did the null value pass the {{IS NOT NULL}} test?

Anyway, expected the same output as the two-line case.



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