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From "Arina Ielchiieva (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-5476) Calculate return type precision value for substring functions (substring, substr, left, right)
Date Fri, 05 May 2017 10:00:09 GMT

     [ https://issues.apache.org/jira/browse/DRILL-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arina Ielchiieva updated DRILL-5476:
------------------------------------
    Summary: Calculate return type precision value for substring functions (substring, substr,
left, right)   (was: Calculate return type precision value for substring functions (substring.
substr, left, right) )

> Calculate return type precision value for substring functions (substring, substr, left,
right) 
> -----------------------------------------------------------------------------------------------
>
>                 Key: DRILL-5476
>                 URL: https://issues.apache.org/jira/browse/DRILL-5476
>             Project: Apache Drill
>          Issue Type: Improvement
>    Affects Versions: 1.10.0
>            Reporter: Arina Ielchiieva
>            Priority: Minor
>
> Currently when applying substring / substr / left / right functions Drill doesn't calculate
return length. Since we know calculation rules for these functions, we can predict return
length.
> For example:
> substring(cast(col as varchar(10), 1, 5) -> varchar(5)
> substring(cast(col as varchar(10), 5) -> varchar(5)
> Similar changes has been done in DRILL-5419 for other string functions.



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