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CombineUnions Logical Optimization

CombineUnions is a base logical optimization that <>.

CombineUnions is part of the Union once-executed batch in the standard batches of the Logical Optimizer.

CombineUnions is simply a <> for transforming <>, i.e. Rule[LogicalPlan].

[source, scala]

// FIXME Demo

Executing Rule

apply(plan: LogicalPlan): LogicalPlan

apply...FIXME

apply is part of the Rule abstraction.

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