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Posted to issues@calcite.apache.org by "Ulrich Kramer (Jira)" <ji...@apache.org> on 2021/06/07 12:00:00 UTC

[jira] [Commented] (CALCITE-4640) Propagate table scan hints to JDBC

    [ https://issues.apache.org/jira/browse/CALCITE-4640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17358552#comment-17358552 ] 

Ulrich Kramer commented on CALCITE-4640:
----------------------------------------

I already opened  [PR 2426](https://github.com/apache/calcite/pull/2426)


> Propagate table scan hints to JDBC
> ----------------------------------
>
>                 Key: CALCITE-4640
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4640
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.27.0
>            Reporter: Ulrich Kramer
>            Priority: Major
>             Fix For: next
>
>
> We would like to use table scan hints to pass [parameters and variables to HANA views|https://help.sap.com/viewer/88fe5f56472e40cca6ef3c3dcab4855b/2.0.04/en-US/fafb3ea432e54fca9eff11648df5bccd.html].
> It should be possible to convert the following Calcite SQL
> {code}
> SELECT * FROM VIEW /*+ PLACEHOLDERS("$$PARAMETER_1$$"='Test') */
> {code}
> using a special {{SqlDialect}} to a HANA specific statement
> {code}
> SELECT * FROM VIEW ('PLACEHOLDER' = ('$$PARAMETER_1$$', 'Test'))
> {code}
> See also my [mail in the mailing list|https://mail-archives.apache.org/mod_mbox/calcite-dev/202105.mbox/%3CD161B82F-5DEC-49A2-A873-4817F4DEB15F%40contoso.com%3E].



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