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Add vector/vhash, a vectorized hash table that maps tuples of key vectors to dense key IDs. It uses open addressing with linear probing, where each slot packs a 32-bit hash salt with a key ID. Keys are kept in vector format so they can be returned directly as vectors. It is meant to be shared by distinct, hash join, and aggregations. Switch the distinct operator from a map of serialized values to vhash, keeping one table per key type.
nwt
approved these changes
Nov 5, 2026
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Add vector/vhash, a vectorized hash table that maps tuples of key vectors to dense key IDs. It uses open addressing with linear probing, where each slot packs a 32-bit hash salt with a key ID. Keys are kept in vector format so they can be returned directly as vectors. It is meant to be shared by distinct, hash join, and aggregations.
Switch the distinct operator from a map of serialized values to vhash, keeping one table per key type.