Ryan Fu created CALCITE-3436:
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Summary: CalciteConnectionConfigImpl.set obliterates previous
property values
Key: CALCITE-3436
URL: https://issues.apache.org/jira/browse/CALCITE-3436
Project: Calcite
Issue Type: Bug
Reporter: Ryan Fu
The cause is that `new Properties(properties)` doesn't copy the previous value
as, say, `new HashMap(map)` does.
* Add a unit test in PlannerTest, that if you call set(x, 1) then set(y, 2) on
a CalciteConnectionConfigImpl, the result contains x and y.
* Consider potentially using `clone()` as Properties implements Cloneable
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