[PoC] Push simple filter conditions into $lookup stage. #345
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WaVEV
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In this PR we tackle the slow join pushing the simple conditions inside the $lookup. the condition is also fix a bug.
New query:
[{'$lookup': {'as': 'm2m_regress_selfrefer_references', 'from': 'm2m_regress_selfrefer_references', 'let': {'parent__field__0': '$_id'}, 'pipeline': [{'$match': {'$expr': {'$and': [{'$eq': ['$$parent__field__0', '$to_selfrefer_id']}, {'$eq': ['$from_selfrefer_id', ObjectId('687ad601daccf7b757ff46ec')]}]}}}]}}, {'$unwind': '$m2m_regress_selfrefer_references'}, {'$match': {'$expr': {'$eq': ['$m2m_regress_selfrefer_references.from_selfrefer_id', ObjectId('687ad601daccf7b757ff46ec')]}}}]Previous query
[{'$lookup': {'as': 'm2m_regress_selfrefer_references', 'from': 'm2m_regress_selfrefer_references', 'let': {'parent__field__0': '$_id'}, 'pipeline': [{'$match': {'$expr': {'$and': [{'$eq': ['$$parent__field__0', '$to_selfrefer_id']}]}}}]}}, {'$unwind': '$m2m_regress_selfrefer_references'}, {'$match': {'$expr': {'$eq': ['$m2m_regress_selfrefer_references.from_selfrefer_id', ObjectId('687ad676396a5de149f2ea4d')]}}}]