[jira] [Created] (IGNITE-15833) Provide interfaces for SQL Extension API

["Konstantin Orlov (Jira)" <ji...@apache.org>]

Konstantin Orlov created IGNITE-15833:
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             Summary: Provide interfaces for SQL Extension API
                 Key: IGNITE-15833
                 URL: https://issues.apache.org/jira/browse/IGNITE-15833
             Project: Ignite
          Issue Type: Sub-task
            Reporter: Konstantin Orlov


During this task we need to provide minimal yet sufficient interfaces to make extension possible. Followed aspects should be covered:
# Interface of the plugin (draft could be found in parent ticket)
# Interface to implement by relational nodes. Looks like we have to use IgniteRel here, but it comes at cost of lost validation: IgniteConvention uses this interface to validate the convention is set for proper rel. Need to think about this.
# Interface for external table (IgniteExternalTable). It could be reduced IgniteTable.
# Interface of the schema. In the prototype the org.apache.calcite.schema.SchemaPlus is used, but it doesn't look as a good decision.
# Currently TableDescriptor contains link to TableImpl and methods to convert from tuple to row and vice versa, thus some refactoring is required




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