Oh, Thank you so much for you reply, Muhammad .
I'll have a try.
At 2019-06-12 15:59:28, "Muhammad Gelbana" <[email protected]> wrote:
>You can provide an instance of
>"org.apache.calcite.rel.type.RelDataTypeSystemImpl" to the
>"org.apache.calcite.tools.Frameworks.ConfigBuilder" to return a different
>type for "some" functions such as SUM and AVG. I'd love to know if there is
>another way to override the output type of a any function but I don't know
>if there is such a thing.
>
>Thanks,
>Gelbana
>
>
>On Wed, Jun 12, 2019 at 8:46 AM Maria <[email protected]> wrote:
>
>> Embarrassing ， My question is how to decide these aggregate result type ?
>>
>>
>> At 2019-06-12 13:40:42, "Maria" <[email protected]> wrote:
>> >Hi, all: I'm using the es-adapter to do some aggregating,such like
>> count(),sum(),avg()..... BUT, these ops will generate new virtual
>> column，maybe something was done by calcite itself to deduce appropriate
>> datatype for this?
>> >I saw some description in http://calcite.apache.org/docs/reference.html:
>> > "Calcite deduces the parameter types and result type of a function
>> from the parameter and return types of the Java method that implements it. "
>> >So the question is does this matter?
>> >
>> >
>> >Thanks for any reply.
>> >Best Regards.
>> >
>>
