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If LEFT JOINs are required for correct results, then trimming the join can lead to incorrect results. Consider case: TBL A: ID | TBL B: ID A_ID 1 1 1 2 Now A.order_by('b__a') did use a join to B, and B's a_id column. This was seen to contain the same value as A's id, and so the join was trimmed. But this wasn't correct as the join is LEFT JOIN, and for row A.id = 2 the B.a_id column is NULL.cea72045
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