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https://issues.apache.org/jira/browse/HIVE-21896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16867979#comment-16867979
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Miklos Gergely commented on HIVE-21896:
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[~ashutoshc] please decide what to accept as proper DDL, and what is not, then
I'll do the code changes, and [~muleho...@gmail.com] can do the documentation
changes.
> SHOW FUNCTIONS / SHOW FUNCTIONS LIKE - clarify
> ----------------------------------------------
>
> Key: HIVE-21896
> URL: https://issues.apache.org/jira/browse/HIVE-21896
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 3.1.1
> Reporter: Miklos Gergely
> Assignee: Ashutosh Chauhan
> Priority: Major
> Fix For: 4.0.0
>
>
> According to
> [https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-ShowFunctions]
> the currently available functions can be listed like this:
> {code:java}
> SHOW FUNCTIONS <pattern>;{code}
> If the user executes this command, they will get the correct list of
> functions, but they will also see this on the standard output:
> {code:java}
> SHOW FUNCTIONS is deprecated, please use SHOW FUNCTIONS LIKE instead.{code}
> If the user uses the
> {code:java}
> SHOW FUNCTIONS LIKE <pattern>;{code}
> command then they will receive the exact same result (though through
> different codes). The only difference is that one can get all the function
> names with "SHOW FUNCTIONS;", while "SHOW FUNCTIONS LIKE;" returns an
> exception, so in this case the pattern is mandatory.
> So there should be a decision if we still accept "SHOW FUNCTIONS" without the
> "LIKE". My suggestion is to accept it only if there is no pattern. so "SHOW
> FUNCTIONS;" is ok, without deprecation message, but "SHOW FUNCTIONS
> <pattern>" should throw an exception.
> Whatever we decide, we should document it appropriately.
> cc [~krishahn]
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