[jira] [Created] (DRILL-3318) SUM(CAST(col as INT)) shows different results when used in window functions

["Deneche A. Hakim (JIRA)" <ji...@apache.org>]

Deneche A. Hakim created DRILL-3318:
---------------------------------------

             Summary: SUM(CAST(col as INT)) shows different results when used in window functions
                 Key: DRILL-3318
                 URL: https://issues.apache.org/jira/browse/DRILL-3318
             Project: Apache Drill
          Issue Type: Bug
          Components: Query Planning & Optimization
    Affects Versions: 1.1.0
            Reporter: Deneche A. Hakim
            Assignee: Jinfeng Ni
            Priority: Minor
             Fix For: Future


I have a parquet file that contains an INT field with large enough values so that the sum of the values overflows the INT limits, and a VARCHAR column with one single value (to force all rows to be part of the same partition).

Computing the sums without casting will give similar results:
{noformat}
SELECT SUM(col_int) OVER(PARTITION BY col_char) FROM dfs.tmp.`3277` LIMIT 1;
+--------------+
|    EXPR$0    |
+--------------+
| -3216087191  |
+--------------+
{noformat}

{noformat}
SELECT SUM(col_int) FROM dfs.tmp.`3277`;
+--------------+
|    EXPR$0    |
+--------------+
| -3216087191  |
+--------------+
{noformat}

But if we cast the column before doing the sum, the results are now different:
{noformat}
SELECT SUM(CAST(col_int AS INT)) OVER(PARTITION BY col_char) FROM dfs.tmp.`3277` LIMIT 1;
+-------------+
|   EXPR$0    |
+-------------+
| 1078880105  |
+-------------+
{noformat}

{noformat}
SELECT SUM(CAST(col_int AS INT)) FROM dfs.tmp.`3277`;
+--------------+
|    EXPR$0    |
+--------------+
| -3216087191  |
+--------------+
{noformat}



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