Multiple expanded `IS NOT DISTINCT FROM` cannot be collapsed back

When a query has multiple `IS NOT DISTINCT FROM` operations, the resulting query won't collapse them back and keeps them in expanded form. 

For example:

left.A IS NOT DISTINCT FROM right.A AND 
left.B IS NOT DISTINCT FROM right.B

will become:

(left.A IS NULL AND right.A IS NULL) OR (left.A = right.A)) AND
(left.B IS NULL AND right.B IS NULL) OR (left.B = right.B)) 

This is particularly a problem with Spark, where the presence of the OR will result in a BroadcastLoopJoin and derail the query execution.