Chunhui Shi created CALCITE-1748:
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Summary: Make CalciteCatalogReader.getSchema extendable to support
dynamically load schema tree - getSchema need to be set to protected to allow
overriding
Key: CALCITE-1748
URL: https://issues.apache.org/jira/browse/CALCITE-1748
Project: Calcite
Issue Type: Bug
Reporter: Chunhui Shi
Assignee: Julian Hyde
In system like Drill, there is a need to load partial schema (e.g. for only one
storage plugin) only when needed. Since Drill has no way to get a full
available schema tree before hand, nor could Drill cache available schema for a
storage plugin(e.g. Hive, MongoDB) since the storage plugin may not have
notification mechanism to update Schema tree timely.
The proposed fix is to load schema dynamically as shown in
https://issues.apache.org/jira/browse/DRILL-5089
To achieve this, we need to make CalciteCatalogReader.getSchema to be protected
so it could be overridden by derived class while the derived class can reuse
other functionalities in CalciteCatalogReader class
private CalciteSchema getSchema(Iterable<String> schemaNames,
SqlNameMatcher nameMatcher)
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