Module changelog 

Z-set changelog __weight column name, shared between the MV producer and upsert-sink consumers. Z-set changelog encoding shared between the materialized-view producer (laminar-db) and the upsert-sink consumers (laminar-connectors).

An aggregating MV emits one row per changed group carrying an Int64 WEIGHT_COLUMN: +n inserts a value with multiplicity n, -n retracts it (a value change for key K is {(K, V_old): -1, (K, V_new): +1}). The column name lives here so the producer and consumers cannot drift on it.

Constants

WEIGHT_COLUMN

Name of the Int64 Z-set weight column appended to aggregating-MV changelog output. +n = insert with multiplicity n, -n = retract.