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https://issues.apache.org/jira/browse/DRILL-3318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mehant Baid updated DRILL-3318:
-------------------------------
Priority: Critical (was: Minor)
> 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: Mehant Baid
> Priority: Critical
> Labels: window_function
> Fix For: 1.1.0
>
> Attachments: 3278.parquet
>
>
> 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 `3278.parquet` LIMIT 1;
> +--------------+
> | EXPR$0 |
> +--------------+
> | -3216087191 |
> +--------------+
> {noformat}
> {noformat}
> SELECT SUM(col_int) FROM `3278.parquet`;
> +--------------+
> | 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
> `3278.parquet` LIMIT 1;
> +-------------+
> | EXPR$0 |
> +-------------+
> | 1078880105 |
> +-------------+
> {noformat}
> {noformat}
> SELECT SUM(CAST(col_int AS INT)) FROM `3278.parquet`;
> +--------------+
> | EXPR$0 |
> +--------------+
> | -3216087191 |
> +--------------+
> {noformat}
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