Is there any tutorial available, I am not able to find any interface with name SortFilterableTable. I am running the queries using JDBC connection and I could not find any way to provide custom rules.
________________________________ From: Xiong Duan <xi...@apache.org> Sent: Wednesday, September 18, 2024 11:09 AM To: dev@calcite.apache.org <dev@calcite.apache.org> Cc: Harshit Dwivedi <harshit.dwiv...@rockwellautomation.com>; Dipesh Sachdev <dipesh.sach...@rockwellautomation.com>; Thomas Keller <tkel...@ra.rockwell.com> Subject: EXTERNAL: Re: Questions Regarding Implementing LIMIT Clause Pushdown in Apache Calcite JDBC Driver [Use caution with links & attachments] As far as I know, you may need to customize the implementation of SortFilterableTable to support pushing limits. Like FilterableTable, then you need to implement SortFilterTableScanRule to make sure can generate the SortFilterableTable. Mihai Budiu <mbu...@gmail.com> 于2024年9月17日周二 16:37写道： > > Isn't limit stored in an order by clause, with potentially an empty list of > fields to sort on? > ________________________________ > From: Vishal Kore <vishal.k...@rockwellautomation.com.INVALID> > Sent: Tuesday, September 17, 2024 1:17:15 AM > To: dev@calcite.apache.org <dev@calcite.apache.org> > Cc: Harshit Dwivedi <harshit.dwiv...@rockwellautomation.com>; Dipesh Sachdev > <dipesh.sach...@rockwellautomation.com>; Thomas Keller > <tkel...@ra.rockwell.com> > Subject: Questions Regarding Implementing LIMIT Clause Pushdown in Apache > Calcite JDBC Driver > > Hi Devs, > > I am currently working on implementing (or extending) a JDBC driver for my > backend storage system using Apache Calcite. I've implemented the > FilterableTable interface, which allows pushing down WHERE clause filters to > the backend using the scan(DataContext ctx, List<RexNode> filters) method. > However, I'm struggling to push down the LIMIT clause to ensure that only the > required number of records are retrieved from the backend. I cannot figure > out how to access the LIMIT clause within the scan method. > Could you please guide me on how to retrieve or implement the LIMIT clause in > this context? > Thanks for your assistance! > Best regards, > Vishal Kore
