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* adds support for `UNNEST` expressions * introduces `LogicalUnnestRule` to transform a `Correlate` doing UNNEST into a `LogicalUnnest` * `UnnestInputCleanupRule` could move the final unnested expr into the `LogicalUnnest` itself (usually its an `mv_to_array` expression) * enhanced source unwrapping to utilize `FilteredDataSource` if it looks right