DocumentDB 0.116: $sort $group prefix pushdown
DocumentDB 0.116-0, released August 20, 2026, introduced prefix sort pushdown for $group accumulators. It lets the grouping stage consume rows in th…
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Extended RUM in DocumentDB: B-tree-like ordered scans for flexible BSON in PostgreSQL
The main challenge in document databases is the flexible nature of fields: the same path can be a scalar, an array, nested, or missing. Despite this…
$lookup join strategies: understanding the trade-offs with flexible documents
In a previous post , I explored how MongoDB chooses between nested loop, indexed loop, and hash join strategies for $lookup . Here, I examine what o…
$exists and non-sparse indexes in MongoDB and in other DocumentDB
In SQL databases, NULL represents an unknown value — not the absence of a value. When a value is simply non-applicable for a given entity, the corre…