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https://issues.apache.org/jira/browse/DRILL-4021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14989734#comment-14989734
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Julian Hyde commented on DRILL-4021:
------------------------------------
For the record, and your table 7 notwithstanding, SQL-2011 only allows
subtraction of a timestamp from another using the '(ts1 - ts2) interval' syntax
(see attached).
But it's fine that Drill goes beyond the standard as long as the semantics are
clear. As Postgres does.
> Cannot subract or add between two timestamps
> --------------------------------------------
>
> Key: DRILL-4021
> URL: https://issues.apache.org/jira/browse/DRILL-4021
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Data Types
> Reporter: Krystal
> Attachments: Screen Shot 2015-11-03 at 3.44.30 PM.png
>
>
> The following subtraction between 2 now() function works:
> select now() - now()from voter_hive limit 1;
> +---------+
> | EXPR$0 |
> +---------+
> | PT0S |
> +---------+
>
> However, the following queries fail:
> select now() - create_time from voter_hive where voter_id=1;
> Error: VALIDATION ERROR: From line 1, column 8 to line 1, column 26: Cannot
> apply '-' to arguments of type '<ANY> - <TIMESTAMP(0)>'. Supported form(s):
> '<NUMERIC> - <NUMERIC>'
> '<DATETIME_INTERVAL> - <DATETIME_INTERVAL>'
> '<DATETIME> - <DATETIME_INTERVAL>'
> select create_time - cast('1997-02-12 15:18:31.072' as timestamp) from
> voter_hive where voter_id=1;
> Error: VALIDATION ERROR: From line 1, column 8 to line 1, column 65: Cannot
> apply '-' to arguments of type '<TIMESTAMP(0)> - <TIMESTAMP(0)>'. Supported
> form(s): '<NUMERIC> - <NUMERIC>'
> '<DATETIME_INTERVAL> - <DATETIME_INTERVAL>'
> '<DATETIME> - <DATETIME_INTERVAL>'
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