Database

[{"record":[{"cellguid":"N118M2J4","value":"Drinks"},{"cellguid":"V671H8W7","value":"Coca Cola"}]},{"record":[{"cellguid":"N118M2J4","value":"Fruits"},{"cellguid":"V671H8W7","value":"Mango"}]},{"record":[{"cellguid":"N118M2J4","value":"Drinks"},{"cellguid":"V671H8W7","value":"Coca Cola"}]},{"record":[{"cellguid":"N118M2J4","value":"Drinks"},{"cellguid":"V671H8W7","value":"Coca Cola"}]},{"record":[{"cellguid":"N118M2J4","value":"Fruits"},{"cellguid":"V671H8W7","value":"Orange"}]},{"record":[{"cellguid":"N118M2J4","value":"Drinks"},{"cellguid":"V671H8W7","value":"Pepsi"}]},{"record":[{"cellguid":"N118M2J4","value":"Drinks"},{"cellguid":"V671H8W7","value":"Pepsi"}]},{"record":[{"cellguid":"N118M2J4","value":"Drinks"},{"cellguid":"V671H8W7","value":"Pepsi"}]},{"record":[{"cellguid":"N118M2J4","value":"Fruits"},{"cellguid":"V671H8W7","value":"Plum"}]},{"record":[{"cellguid":"N118M2J4","value":"Fruits"},{"cellguid":"V671H8W7","value":"Apple"}]},{"record":[{"cellguid":"N118M2J4","value":"Drinks"},{"cellguid":"V671H8W7","value":"Water"}]},{"record":[{"cellguid":"N118M2J4","value":"Drinks"},{"cellguid":"V671H8W7","value":"Water"}]},{"record":[{"cellguid":"N118M2J4","value":"Drinks"},{"cellguid":"V671H8W7","value":"Water"}]},{"record":[{"cellguid":"N118M2J4","value":"Fruits"},{"cellguid":"V671H8W7","value":"Mango"}]}]

Query

db.collection.aggregate([{$group:{_id:"$record",categ:{$first:{$first:"$record"}},item:{$first:{$last:"$record"}},n:{$sum:1}}},{$group:{_id:"$categ",cellguid:{$first:"$categ.cellguid"},value:{$first:"$categ.value"},n:{$sum:"$n"},records:{$push:{cellguid:"$item.cellguid",value:"$item.value",n:"$n"}}}},{$project:{_id:0}}])

Result