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A NPE in Interpreter.CompilerImpl.combinedRowType while enabling Spark

If Spark is enabled, the data context used by the Interpreter becomes
*CalciteConnectionImpl.SlimDataContext* which has no *JavaTypeFactory* by

So when the *org.apache.calcite.interpreter.JoinNode* is initialized and
tries to combine the rowtype of the Join's inputs, a NPE occurs because the
type factory of the data context is called for utilization, but it's NULL
as mentioned.

Is this a missing implementation that I may try to work on ? Or should I
set a configuration value ? What am I missing here please ?