Bit Vector

Views Updated: Dec 15, 2025

Abbreviation

Pronunciation

/bɪt ˈvɛktər/

The bit vector occupies ( n_nullable + 7 ) / 8 bytes.
The record header contains a bit vector for indicating NULL columns.
Then for each row from the fact table scan, the foreign key is also hashed and probed into the bit vector to determine whether the current fact table row is filtered out.
In a bit-vector pushdown, for each push-down, the database server hashes the keys from the dimension table to create a bit vector, which is shipped to the fact table.
Based on intensive study of bitmap compressions, we proposed a rich-extend partition bitmap index approach and a self-adaptive partition word-aligned bit vector compression approach ( APWAH ).

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