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Comment: fix parseJoinCondition & getQualifiedAliases (thanks, Harish)

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Hive enforces the predicate pushdown rules by these methods in the SemanticAnalyzer and JoinPPD classes:

Rule 1: During QBJoinTree construction in Plan Gen, the parse Join Condition parseJoinCondition() logic applies this rule.
Rule 2: During JoinPPD (Join Predicate PushdownPushDown) the get Qualified Alias getQualifiedAliases() logic applies this rule.

Examples

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