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From: "Chris Westin (JIRA)" <jira@apache.org>
To: issues@drill.apache.org
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Subject: [jira] [Updated] (DRILL-3432) Change or document: CAST to interval
 type doesn't reject non-standard strings
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     [ https://issues.apache.org/jira/browse/DRILL-3432?page=3Dcom.atlassia=
n.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Westin updated DRILL-3432:
--------------------------------
    Component/s: Functions - Drill

> Change or document: CAST to interval type doesn't reject non-standard str=
ings
> -------------------------------------------------------------------------=
----
>
>                 Key: DRILL-3432
>                 URL: https://issues.apache.org/jira/browse/DRILL-3432
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Functions - Drill
>            Reporter: Daniel Barclay (Drill)
>             Fix For: 1.2.0
>
>
> 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 li=
teral>) or <unquoted interval string>, or else a "data exception =E2=80=94 =
invalid interval format" exception is raised.
> (<interval literal> is the "{{INTERVAL '1-6' YEAR TO MONTH}}" syntax; <un=
quoted interval string> is the "{{1-6}}" syntax.)
> However, in Drill, a cast specification casting to an interval type accep=
ts strings not allowed by the SQL standard (ISO-8601 durations, e.g., "{{P1=
Y6M"}}).
> &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 rejec=
tion of non-standard strings (for, say, validating strings destined for inp=
ut into a standard-SQL system).)
> To continue providing the ability to convert ISO-8601-format duration str=
ings into interval values without being non-compliant with the SQL standard=
, Drill could provide the conversions in conversion functions (perhaps CONV=
ERT_FROM and/or CONVERT_TO).



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