@uwdata/mosaic-core
Version:
Scalable and extensible linked data views.
14 lines • 780 B
TypeScript
import type { AggregateNode, ColumnRefNode, ExprNode } from '@uwdata/mosaic-sql';
/**
* Determine sufficient statistics to preaggregate the given node. This
* method populates the *preagg* and *aggrs* arguments with necessary
* information for preaggregation optimization.
* @param node An aggregate function.
* @param preagg Map of column names to
* expressions to include in the preaggregation table.
* @param avg Global average query generator.
* @returns Output aggregate expression that uses preaggregated
* sufficient statistics to service updates.
*/
export declare function sufficientStatistics(node: AggregateNode, preagg: Record<string, ExprNode>, avg: (field: ColumnRefNode) => ExprNode): ExprNode | null;
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