DS_HLL_COMBINE (Lakehouse v2)

Kombiniert mehrere DataSketches-HLL-Sketches zu einem einzigen Sketch.

Analyze-Syntax

func.ds_hll_combine(get_column(table, 'hll_sketch'))

Analyze-Beispiele

func.ds_hll_combine(get_column(table, 'hll_sketch'))

┌───────────────────┐
│ (combined sketch) │
└───────────────────┘

SQL-Syntax

DS_HLL_COMBINE(<sketch_column>)

SQL-Beispiele

SELECT DS_HLL_ESTIMATE(DS_HLL_COMBINE(sketch_col)) FROM daily_sketches;

┌───────┐
│ 25000 │
└───────┘