I got some idea understanding basic pieces. Csv tutorial and Csv adapter helped a bit as well. https://calcite.apache.org/docs/tutorial.html
However it would be nice if there was at least some code comments on methods explaining what it is doing. e.g. It's not easy to understand what scan and addFilter does here. It seems like its checking for unary and binary expression but wouldn't it be nice to have some comments there. https://github.com/apache/calcite/blob/master/example/csv/src/main/java/org/apache/calcite/adapter/csv/CsvFilterableTable.java Thanks, Nirav On Thu, Jul 27, 2017 at 9:22 AM, Julian Hyde <[email protected]> wrote: > Totally agree with Michael's advice to start from an existing adapter. > > There is example/csv, an example adapter intentionally kept simple. > But if your adapter is more complex, and involves for instance > generating a query for a back-end DB, then use a more complex adapter > as your template. > > Did you look in https://calcite.apache.org/docs/adapter.html? I know > it feels that we are woefully lacking in documentation, but people > don't read the documentation we have, there's not much incentive to > write more. > > There's also https://www.slideshare.net/julianhyde/a-smarter-pig- > building-a-sql-interface-to-apache-pig-using-apache-calcite. > > On Thu, Jul 27, 2017 at 8:55 AM, Michael Mior <[email protected]> wrote: > > That's still basically correct. You may find it easiest to model things > > after one of the existing adapters. When I was writing the Cassandra > > adapter, I found the MongoDB adapter to be helpful. It is also a question > > of what the data source you're hoping to add looks like. You'll probably > > have the most success starting with a similar adapter. > > > > -- > > Michael Mior > > [email protected] > > > > 2017-07-26 20:16 GMT-04:00 Nirav Patel <[email protected]>: > > > >> https://datapsyche.wordpress.com/2014/07/18/sql-over- > >> anything-with-an-optiq-adaptor/ > >> > >> > >> > >> > >> > >> On Wed, Jul 26, 2017 at 5:13 PM, Julian Hyde <[email protected]> wrote: > >> > >> > Where did you look? What did you find? > >> > > >> > > On Jul 26, 2017, at 5:06 PM, Nirav Patel <[email protected]> > >> wrote: > >> > > > >> > > Hi, > >> > > > >> > > Is there any guide/tutorial on how to write adapter for new > datasource? > >> > > > >> > > Thanks > >> > > > >> > > -- > >> > > > >> > > > >> > > [image: What's New with Xactly] <http://www.xactlycorp.com/ > >> email-click/> > >> > > > >> > > <https://www.nyse.com/quote/XNYS:XTLY> [image: LinkedIn] > >> > > <https://www.linkedin.com/company/xactly-corporation> [image: > >> Twitter] > >> > > <https://twitter.com/Xactly> [image: Facebook] > >> > > <https://www.facebook.com/XactlyCorp> [image: YouTube] > >> > > <http://www.youtube.com/xactlycorporation> > >> > > >> > > >> > >> -- > >> > >> > >> [image: What's New with Xactly] <http://www.xactlycorp.com/email-click/ > > > >> > >> <https://www.nyse.com/quote/XNYS:XTLY> [image: LinkedIn] > >> <https://www.linkedin.com/company/xactly-corporation> [image: Twitter] > >> <https://twitter.com/Xactly> [image: Facebook] > >> <https://www.facebook.com/XactlyCorp> [image: YouTube] > >> <http://www.youtube.com/xactlycorporation> > >> > -- [image: What's New with Xactly] <http://www.xactlycorp.com/email-click/> <https://www.nyse.com/quote/XNYS:XTLY> [image: LinkedIn] <https://www.linkedin.com/company/xactly-corporation> [image: Twitter] <https://twitter.com/Xactly> [image: Facebook] <https://www.facebook.com/XactlyCorp> [image: YouTube] <http://www.youtube.com/xactlycorporation>
