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https://issues.apache.org/jira/browse/CALCITE-7592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18086740#comment-18086740
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Kirill Tkalenko commented on CALCITE-7592:
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[~julianhyde] I added a few points to the description.
> I don’t think there’s any syntactic need for parentheses.
It doesn't really matter to me; I just liked that postgressql option. I can do
it without the parentheses.
> I believe there is a request for bind variables in fetch. Can you link to
>that case?
If you're referring to "?", then yes, we need it for the project we're building
on Apache Ignite.
We'll also need something like "(1 + some_udf(?))".
There is some legacy code we can't change, and we need this when rewriting
queries.
> 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
> Priority: Major
> Labels: pull-request-available
>
> 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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