[jira] [Assigned] (IMPALA-889) Add trim() function matching ANSI SQL definition

["Zoram Thanga (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zoram Thanga reassigned IMPALA-889:
-----------------------------------

    Assignee:     (was: Zoram Thanga)

> Add trim() function matching ANSI SQL definition
> ------------------------------------------------
>
>                 Key: IMPALA-889
>                 URL: https://issues.apache.org/jira/browse/IMPALA-889
>             Project: IMPALA
>          Issue Type: New Feature
>          Components: Backend
>    Affects Versions: Impala 1.2.4
>            Reporter: Jonathan Seidman
>            Priority: Minor
>              Labels: ansi-sql, built-in-function, ramp-up
>
> Add support for an ISO-SQL compliant trim() function, i.e. trim([leading | trailing | both] [characters] from string). Lack of this impacts users of BI tools migrating existing SQL from other systems.
> Reference: https://my.vertica.com/docs/8.1.x/HTML/index.htm#Authoring/SQLReferenceManual/Functions/String/TRIM.htm
> Part of the ANSI definition
> {noformat}
> <trim function> ::=
>   TRIM <left paren> <trim operands> <right paren>
> <trim operands> ::=
>   [ [ <trim specification> ] [ <trim character> ] FROM ] <trim source>
> <trim source> ::=
>   <character value expression>
> <trim specification> ::=
>     LEADING
>   | TRAILING
>   | BOTH
> {noformat}



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