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From Lai Zhou <>
Subject Re: Calcite push-down operation
Date Thu, 09 May 2019 08:55:55 GMT
@Wangminhao Gou
I think you can reference the JdbcConvention , that would push queries to
JDBC datasource as much as possible,.

勾王敏浩 <> 于2019年5月9日周四 下午4:18写道:

> Hi,
> My name is Wangminhao Gou. I've read the CSV example of calcite and
> written several other adapters following the CSV adapter(However, all are
> scannable). Now I'm going to write the adapter for IoTDB.
> However,Considering performance, we don't want to just implement
> ScannableTable. We want to push as many operations as possible down to
> IoTDB.
> Here are my questions:
> 1.We want to get the user's query statement first. Turn this query
> statement into an IoTDB recognizable query. Use IoTDB to process the query
> and get a resultSet. Then use this resultSet to perform scan operations and
> stitch it together into the final resultSet of calcite. How can I get the
> query in the adapter and can I get the resultSet first and then put it
> together?
> 2.If my above considerations cannot be realized, is there any other way to
> push queries down to the IoTDB database?
> Best Regards,
> Wangminhao Gou

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