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https://issues.apache.org/jira/browse/CALCITE-6277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17819348#comment-17819348
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Mihai Budiu commented on CALCITE-6277:
--------------------------------------
'Infinity' is a string in SQL. These functions require a double argument, so
the string is implicitly cast to a double.
You can make sure that this happens by using an explicit cast: log10(CAST
'Infinity' as DOUBLE).
The databases may have different names for the double type, though. Postgres
uses "double precision" for example.
Postgres does support Infinity as a literal, you don't need quotes.
> I don't want calcite to adapt to mysql and postgres and other SQL dialects"
But this is exactly what you have to do to implement these functions.
You have a specification of these functions, which is how they work in these
dialects. You have to emulate that precisely, everything else is a bug. Calcite
was designed to be able to emulate as many dialects as possible, so it is very
flexible. It doesn't really have "its own processing method".
> About the processing of +infinity parameters and -infinity parameters in
> math function
> ---------------------------------------------------------------------------------------
>
> Key: CALCITE-6277
> URL: https://issues.apache.org/jira/browse/CALCITE-6277
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.36.0
> Reporter: Caican Cai
> Priority: Major
> Fix For: 1.37.0
>
> Attachments: 2024-02-21 13-10-00屏幕截图.png
>
>
> {code:java}
> log10('-Infinity');
> log2('-Infinity');
> power('Infinity',2){code}
> As above, using the + infinity function in some math functions will report an
> error in calcite, but mysql and posgtres will not report an error. I think
> the + infinity parameter is meaningful in mathematics.
> {code:java}
> --postgres
> postgres=# select power('Infinity', -2);
> power
> -------
> 0
> (1 row)postgres=# select log('Infinity', 2);
> log
> -----
> 0
> (1 row)postgres=# select log10('Infinity');
> log10
> ----------
> Infinity
> (1 row)postgres=# select power('Infinity', 2);
> power
> ----------
> Infinity
> (1 row)
>
> --mysql
> mysql> select log10('+Infinity');
> +--------------------+
> | log10('+Infinity') |
> +--------------------+
> | NULL |
> +--------------------+
> 1 row in set, 2 warnings (0.00 sec)mysql> select power('Infinity', 2);
> +----------------------+
> | power('Infinity', 2) |
> +----------------------+
> | 0 |
> +----------------------+
> 1 row in set, 1 warning (0.00 sec)mysql> select power('-Infinity', 2);
> +-----------------------+
> | power('-Infinity', 2) |
> +-----------------------+
> | 0 |
> +-----------------------+
> 1 row in set, 1 warning (0.00 sec)mysql> select log10('-Infinity');
> +--------------------+
> | log10('-Infinity') |
> +--------------------+
> | NULL |
> +--------------------+
> 1 row in set, 2 warnings (0.00 sec)
> {code}
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