[jira] [Commented] (CALCITE-1066) Add an extension operator table with Oracle-specific operators

["Julian Hyde (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-1066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15172883#comment-15172883 ] 

Julian Hyde commented on CALCITE-1066:
--------------------------------------

The fix to CALCITE-1054 will make IS NOT DISTINCT FROM, and hence DECODE, more efficient.

> Add an extension operator table with Oracle-specific operators
> --------------------------------------------------------------
>
>                 Key: CALCITE-1066
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1066
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>              Labels: newbie
>
> Add a mechanism to allow connections to use additional operator tables, the first of which will be one with Oracle-specific functions. We don't aim to do every function.
> Important functions:
> * DECODE
> * NVL
> * RTRIM
> * LTRIM
> * LPAD
> * RPAD
> * TO_CHAR
> * TO_NUMBER
> * TO_DATE
> * TRUNC
> * SUBSTR (different from standard SUBSTRING)
> * INSTR
> Easy:
> * PI
> * DEGREES
> * RADIANS
> * SIGN
> * GREATEST
> * LEAST



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