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https://issues.apache.org/jira/browse/DRILL-2212?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Victoria Markman closed DRILL-2212.
-----------------------------------
> NULLIF function should be documented
> ------------------------------------
>
> Key: DRILL-2212
> URL: https://issues.apache.org/jira/browse/DRILL-2212
> Project: Apache Drill
> Issue Type: Bug
> Components: Documentation
> Affects Versions: 0.8.0
> Reporter: Victoria Markman
> Assignee: Kristine Hahn
>
> NULLIF ( expression , expression )
> Arguments: any valid scalar expression
> Return Types: returns the same type as the first expression.
> NULLIF returns the first expression if the two expressions are not equal.
> If the expressions are equal, NULLIF returns a null value of the type of the
> first expression.
> {code}
> 0: jdbc:drill:schema=dfs> select d9, d18 from alltypes limit 1;
> +------------+------------+
> | d9 | d18 |
> +------------+------------+
> | 1032.65 | 1032.6516 |
> +------------+------------+
> 1 row selected (0.081 seconds)
> 0: jdbc:drill:schema=dfs> select nullif(d9, d18) from alltypes limit 1;
> +------------+
> | EXPR$0 |
> +------------+
> | 1032.65 |
> +------------+
> 1 row selected (0.079 seconds)
> 0: jdbc:drill:schema=dfs> select nullif(d9, d9) from alltypes limit 1;
> +------------+
> | EXPR$0 |
> +------------+
> | null |
> +------------+
> 1 row selected (0.083 seconds)
> 0: jdbc:drill:schema=dfs> select nullif(round(d9), trunc(d9)) from alltypes
> limit 1;
> +------------+
> | EXPR$0 |
> +------------+
> | 1033 |
> +------------+
> 1 row selected (0.094 seconds)
> {code}
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