Ivan Grgurina created CALCITE-3091:
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Summary: Expose defaultSchema .json parameter to SchemaFactory
Key: CALCITE-3091
URL: https://issues.apache.org/jira/browse/CALCITE-3091
Project: Calcite
Issue Type: Improvement
Components: jdbc-adapter
Affects Versions: 1.19.0
Reporter: Ivan Grgurina
Currently, when you use JDBC adapter and have custom schema factory, you
provide .json file with your schema definition and link to your SchemaFactory
implementation that is called to create that Schema for the rest of the system.
That .json file has in root a 'defaultSchema' parameter that Calcite uses to
know what the default schema is. Unfortunately, that parameter is not exposed
when implementing SchemaFactory interface, and there are use cases where that
would be useful.
For example, one use case is when having multiple custom schemas, to know which
one is the default one while you're creating it inside SchemaFactory
implementation.
My specific use-case is I want to use that .json parameter for "filtering"
schemas. The current workaround for that is to have two SchemaFactory
implementations that are then later connected in code, but it would be easier
if I could just check in SchemaFactory if my schema is the defaultSchema and do
the appropriate logic there.
I'm willing to do the work to make this change if someone can point me in the
right direction.
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