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From "Mehant Baid (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-975) Null-on-exception option for cast functions
Date Wed, 02 Jul 2014 01:22:24 GMT

     [ https://issues.apache.org/jira/browse/DRILL-975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Mehant Baid updated DRILL-975:

    Attachment: DRILL-975.patch

> Null-on-exception option for cast functions
> -------------------------------------------
>                 Key: DRILL-975
>                 URL: https://issues.apache.org/jira/browse/DRILL-975
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Functions - Drill
>            Reporter: Steven Phillips
>            Assignee: Jacques Nadeau
>         Attachments: DRILL-975.patch
> Currently, if a particular value cannot be cast to the target type, an exception is thrown
and the query fails. We should have a mode that will treat the output of all cast functions
as nullable, and return a null value if the cast fails, rather than throwing an exception.
> An important example where this is important is when using the Text reader. The text
reader always produces a single, RepeatedVarChar column. The columns are then cast to the
appropriate type. For the columns that are cast to numeric types, if there is no value (i.e.
it's an empty string), currently this will throw NumberFormatException. What we really want
is for it to produce a Null value.

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