[jira] [Updated] (CALCITE-1798) In JDBC adapter, generate dialect-specific SQL for FLOOR operator

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

     [ https://issues.apache.org/jira/browse/CALCITE-1798?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde updated CALCITE-1798:
---------------------------------
    Summary: In JDBC adapter, generate dialect-specific SQL for FLOOR operator  (was: Jdbc dialect specific datetime floor operators)

> In JDBC adapter, generate dialect-specific SQL for FLOOR operator
> -----------------------------------------------------------------
>
>                 Key: CALCITE-1798
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1798
>             Project: Calcite
>          Issue Type: Bug
>          Components: jdbc-adapter
>            Reporter: Chris Baynes
>            Assignee: Julian Hyde
>              Labels: dialect
>
> The FLOOR operator (on dates) is currently broken for all jdbc dialects.
> The syntax allowed by the parser looks like: "FLOOR(datetime to timeUnit)".
> However no jdbc dialect (as far as I'm aware) actually name the function FLOOR:
> In postgres: DATE_TRUNC('year', my_datetime)
> In hsqldb: TRUNC ( my_datetime, 'YYYY' )
> In oracle: TRUNC(my_datetime, 'YEAR')
> In mysql: There's no direct equivalent in mysql (though it could be emulated with some nasty timestamp diffing)
> The other issue is that the timeUnits are sometimes also named differently by each dialect (e.g. 'YYYY' in hsqldb).



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