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When true, the cost based optimizer, which uses the Calcite framework, will be enabled.

hive.cbo.returnpath.hiveop

• Default Value: false 
• Added In: Hive 1.2.0 with HIVE-9581 and HIVE-9795 

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.optimize.null.scan

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

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