[CALCITE-3093] Remove JDBC connection calls from PlannerImpl - ASF JIRA

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Details

Type: Improvement
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 1.20.0
Component/s: core
Labels:
- pull-request-available

Description

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