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https://issues.apache.org/jira/browse/IMPALA-889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Smith resolved IMPALA-889.
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Fix Version/s: Impala 4.5.0
Resolution: Fixed
> 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
> Assignee: Mihaly Szjatinya
> Priority: Minor
> Labels: ansi-sql, built-in-function, ramp-up
> Fix For: Impala 4.5.0
>
>
> 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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