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The first step is to realize that you are looking at an optimization problem.
Congratulations, you’ve done that.
The next step is to evaluate the possible optimization techniques. Volcano is
suitable in cases where there is dataflow - where the solution is a tree or
DAG. It doesn’t seem that
Hello,
In one of my use case i am working on DATE and TIMESTAMP based operands. We
have
select date + interval '1' DAY from table;
I need to map this to target dialect.
select target_func(date, interval '1' DAY) from table;
*Approach*: I am planning to intercept the '+' operator in the
I guess you’re talking about the JDBC adapter, and generating SQL for other
dialects.
I don’t recall why we have stripCastFromString() but I know that it was
introduced for a good reason. Try making it no-op and see which tests fail.
Julian
> On Aug 23, 2019, at 3:32 AM, Soma Mondal wrote:
Hello,
We have a REL which has this information
select * from employee where employee_id = cast('12' as float);
but Calcite removes the CAST from the STRING literal('12' in our case).
select * from employee where employee_id = '12';
There are dialects which needs explicit casting in the above
Hi,
a short update on this matter.
We had a meetup yesterday with the PLC4X community and I prepared a very first
"demo" implementation of the Optimizer / Framework.
I tried to organize it after the Calcite / Volcano approach.
We had several discussions and experimented a bit and some things
Incomplete, but here's one for PostgreSQL as well
https://github.com/tshprecher/antlr_psql
--
Michael Mior
mm...@apache.org
Le jeu. 22 août 2019 à 14:38, Julian Feinauer
a écrit :
>
> Hi,
>
> there are some SQL dialect grammars online here (for ANTLR4)
>
>
The Apache Jenkins build system has built Calcite-Master (build #1313)
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Hong Shen created CALCITE-3287:
--
Summary: Union's getRowCount in RelMdRowCount has not concern
'union all'
Key: CALCITE-3287
URL: https://issues.apache.org/jira/browse/CALCITE-3287
Project: Calcite
