[jira] [Commented] (PHOENIX-3215) Add oracle regexp_like function in phoenix

["Loknath Priyatham Teja Singamsetty (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PHOENIX-3215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15445188#comment-15445188 ] 

Loknath Priyatham Teja Singamsetty  commented on PHOENIX-3215:
--------------------------------------------------------------

From [~larsh],

Regex' have the potential to be extremely slow and CPU intensive. We need to be careful if we're allowing this at scale.

> Add oracle regexp_like function in phoenix
> ------------------------------------------
>
>                 Key: PHOENIX-3215
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3215
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: Loknath Priyatham Teja Singamsetty 
>            Assignee: Loknath Priyatham Teja Singamsetty 
>            Priority: Minor
>
> We have regexp_substr today which returns a substring of a string by applying a regular expression start from the offset of a one-based position.
> However, when using query builder frameworks like JOOQ code generators that generates java code from database and build type safe sql queries out of box, lack of regexp_like syntax is making developers to take work arounds to build the equivalent queries.
> Hard coding Query for regexp_substr as JOOQ does not support it:
> {quote}
> regex = regex + " AND regexp_substr("+ TestResultEntity.Column.BASELINE_MESSAGE.getName() +", ?)" + matching;
> {quote}
> Here is the oracle documentation for regexp_like https://docs.oracle.com/cd/B12037_01/server.101/b10759/conditions018.htm



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