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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 ?


( ! ) Warning: include(msgfooter.php): failed to open stream: No such file or directory in /var/www/git/apache-calcite-development/msg03756.html on line 83
Call Stack
10.0006363160{main}( ).../msg03756.html:0

( ! ) Warning: include(): Failed opening 'msgfooter.php' for inclusion (include_path='.:/var/www/git') in /var/www/git/apache-calcite-development/msg03756.html on line 83
Call Stack
10.0006363160{main}( ).../msg03756.html:0