[jira] [Comment Edited] (CALCITE-7592) Add expression support for FETCH

["Kirill Tkalenko (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-7592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18099424#comment-18099424 ] 

Kirill Tkalenko edited comment on CALCITE-7592 at 7/27/26 12:11 PM:
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[~zwh] Thanks for noticing that; I didn't do it intentionally while resolving conflicts with Copilot's help. I will fix this.

[~jensen] I don't see that a revert was performed; what is the correct way to do it?


was (Author: ktkalenko@gridgain.com):
[~jensen] [~zwh] Thanks for noticing and reverting that; I didn't do it intentionally while resolving conflicts with Copilot's help. I will fix this.

> Add expression support for FETCH
> --------------------------------
>
>                 Key: CALCITE-7592
>                 URL: https://issues.apache.org/jira/browse/CALCITE-7592
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Kirill Tkalenko
>            Assignee: Kirill Tkalenko
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.43.0
>
>
> I have not found any objections to the previously submitted proposal [Add expression for OFFSET ROWS and FETCH FIRST ROWS ONLY|https://lists.apache.org/thread/xgdgc8mgxh7rjclzblzy3lk5fcjyn1q4]; I propose implementing it for "FETCH" in this ticket.
> h3. Brief description:
> It is proposed to add the ability to use arithmetic expressions and scalar function calls for "FETCH" only when enclosed in parentheses, by analogy with other DBMSs.
> Currently, it's
> {noformat}
> [ FETCH { FIRST | NEXT } [ count ] { ROW | ROWS } ONLY ]{noformat}
> , but the proposal is to make it
> {noformat}
> [ FETCH { FIRST | NEXT } [ count | (expression) ] { ROW | ROWS } ONLY ]{noformat}
> .
> h3. Query examples:
>  # select * from person fetch next (? + 1) rows only.
>  # select * from person fetch next (udf(?)) rows only.
>  # select * from person fetch next (1 + nvl(?, 10000)) rows only.
> h3. DBMSs supporting similar functionality:
>  # [postgresql|https://www.postgresql.org/docs/18/sql-select.html#SQL-LIMIT]
>  # [oracle|https://docs.oracle.com/en/database/oracle/oracle-database/12.2/sqlrf/SELECT.html] 
>  # [h2|https://h2database.com/html/commands.html#select] 
>  # [msql|https://learn.microsoft.com/ru-ru/sql/t-sql/queries/select-order-by-clause-transact-sql?view=sql-server-ver17#fetch--first--next---integer_constant--fetch_row_count_expression---row--rows--only]
> h3. Validation rules:
>  # Expression should be either arithmetic or scalar.
>  # Result of the expression should be an integer and range from 0 to Integer.MAX_VALUE.
>  # Expressions should't use table columns.



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