object CollapseProject extends Rule[LogicalPlan]
Combines two Project operators into one and perform alias substitution,
merging the expressions into one single expression for the following cases.
1. When two Project operators are adjacent.
2. When two Project operators have LocalLimit/Sample/Repartition operator between them
and the upper project consists of the same number of columns which is equal or aliasing.
GlobalLimit(LocalLimit) pattern is also considered.
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