Hi community,
Thanks for your attention. : ) Currently, Apache ShardingSphere community plans to leverage Apache Calcite to implement federated SQL query, i.e., the query from different database instances [1]. The draft approach is that we consider using the custom adaptor with the SQL parser of ShardingSphere itself (Antlr involved), and transforming the parsed result to the algebra of Calcite. Lastly, Calcite will execute the SQLs by means of the custom adaptor. Currently, I know the entrance of calling the custom adaptor is to use the `DriverManager.getConnection(CalciteUrl)`, which will get Calcite's SQL parsing involved. But we want to avoid twice SQL parsing, which means we wish to ignore the SQL parsing of CalciteN . My question is that how we can leverage Calcite adaptor without using Calcite parser. Could you give me some hints? Very appreciated your any help and reply. Regards, Trista [1] https://github.com/apache/shardingsphere/issues/8284 Juan Pan (Trista) Senior DBA & PMC of Apache ShardingSphere E-mail: panj...@apache.org
