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Comment: author: Harish Butani (please review edits in definition of Null Supplying table)

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Preserved Row Table

Null Supplying Table

Join
Predicate

Case J1:
Not Pushed

Case J2:
Pushed

Where
Predicate

Case W1:
Pushed

Case W2:
Not Pushed

See Examples below for illustrations of cases J1, J2, W1, and W2.

Hive Implementation

Hive enforces the predicate pushdown rules by:

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