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When true, this optimization to CBO Logical plan will add rule to introduce not null filtering on join keys.  Controls Calcite plan to Hive operator conversion.  Overrides hive.optimize.remove.identity.project when set to false.

hive.cbo.cnf.maxnodes

• Default Value: -1

• Added In: Hive 2.1.1 with HIVE-14021

When converting to conjunctive normal form (CNF), fail if the expression exceeds the specified threshold; the threshold is expressed in terms of the number of nodes (leaves and interior nodes). The default, -1, does not set up a threshold.

hive.optimize.null.scan

• Default Value: true
• Added In: Hive 0.14.0 with HIVE-7385

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For WebHCat configuration, see Configuration Variables in the WebHCat manual.

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