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From "Daniel Barclay (Drill) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-3432) Change or document: CAST to interval type doesn't reject non-standard strings
Date Tue, 30 Jun 2015 19:53:04 GMT
Daniel Barclay (Drill) created DRILL-3432:
---------------------------------------------

             Summary: Change or document: CAST to interval type doesn't reject non-standard
strings
                 Key: DRILL-3432
                 URL: https://issues.apache.org/jira/browse/DRILL-3432
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Daniel Barclay (Drill)


In ISO/IEC 9075-2:2011(E) section 6.13 <cast specification>, General Rule 19 case b
says that, in a <cast specification> casting to an interval type, a character string
value must be a valid interval <literal> (<interval literal>) or <unquoted
interval string>, or else a "data exception — invalid interval format" exception is raised.

(<interval literal> is the "{{INTERVAL '1-6' YEAR TO MONTH}}" syntax; <unquoted interval
string> is the "{{1-6}}" syntax.)

However, in Drill, a cast specification casting to an interval type accepts strings not allowed
by the SQL standard (ISO-8601 durations, e.g., "{{P1Y6M"}}).
&nbsp;

Drill should either follow the SQL standard or document the non-standard behavior in the end-user
documentation.
&nbsp;

(Note that Drill's current behavior is not quite an extension:  Although it does extend the
set of strings that can be converted, it lacks the rejection of non-standard strings (for,
say, validating strings destined for input into a standard-SQL system).)

To continue providing the ability to convert ISO-8601-format duration strings into interval
values without being non-compliant with the SQL standard, Drill could provide the conversions
in conversion functions (perhaps CONVERT_FROM and/or CONVERT_TO).




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