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Fix to #27072 - Suboptimal SQL generation for query with optional nav…
…igation, its collection navigation and lateral join When expanding collection navigation we added a check to filter out rows for which parent value is null and only afterwards match inner and outer keys. This could happen when chaining collection navigation after optional reference. Problem was that during translation we try to convert the collection subquery to a join and if that succeeds we don't need the null check anymore - joins key comparison doesn't match nulls. However, we also remove the null check when we are not able to convert to JOIN and use APPLY instead. Fix is to save the original predicate before we try to extract the join predicate and then for APPLY case re-apply the original predicate and only use the extracted join predicate for the JOIN case. Fixes #27072
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