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opt: improve CanBeCompositeSensitive
The current implementation of CanBeCompositeSensitive can be quadratic in the expression size because each node builds the entire set of outer columns for that subtree. This change reworks the code and defines the logical property that we were approximating by checking the outer cols directly. This also reveals a bug in the previous version which did not detect relational subtrees when there are no outer columns. Release note: None
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