Stamatis Zampetakis created CALCITE-7022:
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Summary: Decouple ModelHandler from CalciteConnection
Key: CALCITE-7022
URL: https://issues.apache.org/jira/browse/CALCITE-7022
Project: Calcite
Issue Type: Task
Reporter: Stamatis Zampetakis
Assignee: Stamatis Zampetakis
[ModelHandler|https://github.com/apache/calcite/blob/f8fc4ca37e4a60236894c382ce8c8553adc3d43a/core/src/main/java/org/apache/calcite/model/ModelHandler.java]
is mainly a parser that can transform YAML/JSON files into SchemaPlus objects.
Currently, the class requires a CalciteConnection in order to be instantiated
and the latter is a pretty heavyweight object. The usage of the
CalciteConnection makes it rather cumbersome to instantiate and use the parsing
capabilities of the ModelHander independently.
In reality though, the handler does not need much from the CalciteConnection
and we could easily refactor the handler to not depend on the connection at all.
The motivation for this change is to facilitate the creation of schema objects
from YAML/JSON files. A prominent use-case that I have in mind is the use of
ModelHandler in unit tests where the models reside in JSON/YAML files.
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