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Wyatt Alt
254688df96
A view could only map source rows one to one, or one to many through a FROM-position item, so nothing could see all the rows sharing a key. A view query now takes `GROUP BY expr, ...` with aggregate projections, planned and executed by DataFusion over the lance scan. A group spans fragments, so a grouped view is recomputed in full whenever its source changes; each row's provenance is its group's smallest source row id. Such a query is stored as definition format 2, so a reader that predates grouping reports the view as unrefreshable instead of failing to parse it. Stacked on #4190.
542 B
542 B
@lancedb/lancedb • Docs
@lancedb/lancedb / MaterializedViewDefinition
Interface: MaterializedViewDefinition
The query that defines a materialized view, as stored:
SELECT columns FROM [ns.]table [, function(args) AS alias | , UNNEST(column) AS alias] [WHERE predicate] [GROUP BY expr, ...] [LIMIT n]. A Function in FROM
position yields one row per element it returns.
Properties
query
query: string;
The defining query, in the canonical spelling the server stores.