Run this script in the noPassthrough suite /** * @tags: [ * featureFlagShardFilteringDistinctScan, * ] */ import {ShardingTest} from "jstests/libs/shardingtest.js" ; const st = new ShardingTest({shards: 2}); const db = st.getDB( "test" ); const primaryShard = st.shard0.shardName; assert .commandWorked(st.s.adminCommand({enableSharding: db.getName(), primaryShard})); const coll = db[jsTestName()]; assert .commandWorked(st.s.adminCommand({shardCollection: coll.getFullName(), key: {a: 1}})); const pipeline = [ {$match: {nss: {$ne: ""}}}, {$group: {_id: "$nss" , placement: {$top: {output: "$$CURRENT" , sortBy: { "timestamp" : -1}}}}}, {$match: {_id: {$not: {$regex: /^[^.]+\.system\.resharding\..+$/}}}} ]; print( "running explain..." ); const explain = st.s.getDB( 'config' ).placementHistory.explain().aggregate(pipeline); print( "explain:" , tojson(explain)); st.stop();