Eric had said: >> But then what about a query like this: >> >> SELECT * FROM T1 >> LEFT OUTER JOIN T2 ON ( T2.a = T1.a ) AND ( T2.b = T1.b ) AND >> ( T2.c = T1.c ); >> >> xBestIndex will get called here for T1 with 3 constraints, c, b, and a, in >> that order.
To which Gunter replied in part: > an Index on the LHS Table of a LEFT OUTER join never helps, because you are > requesting to retrieve all rows of the LHS > anyway. SQLite is calling xBestIndex with constraints on T1 for symmetry > purposes only (this may even be considered a bug). > Try again with indexes on T2. Very good point, so this is what puzzles me: xBestIndex is *never called* for T2 for this query (!). To my undoubtedly noob mind, *that* seems like a bug. Thanks again! Eric
