[jira] [Commented] (CALCITE-5685) Support MySQL CONVERT function that works on data types

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

    [ https://issues.apache.org/jira/browse/CALCITE-5685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17719540#comment-17719540 ] 

Julian Hyde commented on CALCITE-5685:
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Can you describe how this differs from CALCITE-5548 (MSSql {{CONVERT}})?

> Support MySQL CONVERT function that works on data types
> -------------------------------------------------------
>
>                 Key: CALCITE-5685
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5685
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.34.0
>            Reporter: ZheHu
>            Assignee: ZheHu
>            Priority: Minor
>
> CONVERT function in MySQL has two usage：
>  # convert(s USING transcodingName): as described in [CALCITE-5664|https://issues.apache.org/jira/projects/CALCITE/issues/CALCITE-5664]
>  # convert(value, type): equivalent to CAST function that converts value to specific type.
> Here are some examples:
>  * convert(150, CHAR)
>  * convert(now(), DATE)
>  * convert('9.5', DECIMAL(10, 2))
>  * convert(15, SIGNED)
>  * convert(-2, UNSIGNED)
> Noted: for CONVERT or CAST function in MySQL, they only support converting to some specific data types(binary、char、date、time、datetime、decimal、signed、unsigned. Moreover, the last two aren't JDBC sql Types).
>  



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