Hongze Zhang created CALCITE-3093:
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Summary: Decouple JDBC connection calls from PlannerImpl
Key: CALCITE-3093
URL: https://issues.apache.org/jira/browse/CALCITE-3093
Project: Calcite
Issue Type: Improvement
Components: core
Reporter: Hongze Zhang
Assignee: Hongze Zhang
Currently the class {{PlannerImpl}} creates JDBC connections[1] internally to
instantiate {{RelOptPlanner}}. For improving the design I suggest to reverse
the call chain, for example, we can make JDBC API call PlannerImpl to create
{{RelOptPlanner}}, {{SqlValidator}}, {{SqlToRelConverter}} instances, etc.
This JIRA topic is the first step of the improvement - we should decouple the
use of JDBC API from PlannerImpl. Planner API is designed to be a reusable
toolkit and we should make it work individually without the help of JDBC API.
[1]
https://github.com/apache/calcite/blob/4e1b68e3c0b2a90832cc790c6166cebb14ae2970/core/src/main/java/org/apache/calcite/prepare/PlannerImpl.java#L143-L151
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