Query: Prune SelectExpression to remove not needed TPT LeftJoin tables #21992
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Resolves #21773 - For top level SelectExpression in client code, we preserve whole projection. - We search for all the referenced column for each table in SelectExpression - If there are no references outside and if it is LeftJoinExpression for TPT (which is remembered through a state in SelectExpression), then we remove the table altogether. - If the table is nested SelectExpression (direct or through a join) then we take referenced columns for that table and prune projection of inner SelectExpression and apply process recursively to prune TPT pattern inside subquery. - Removes derived tables when projecting out only base properties of TPT - Removes derived tables when joining with collection on base and not selecting any of the derived properties of TPT
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AndriySvyryd
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Aug 10, 2020
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Resolves #21773
For top level SelectExpression in client code, we preserve whole projection.
We search for all the referenced column for each table in SelectExpression
Removes derived tables when projecting out only base properties of TPT
Removes derived tables when joining with collection on base and not selecting any of the derived properties of TPT