ApproxCardinalityReduce Output Table Schema
| Column | Data Type | Description |
|---|---|---|
| target_column | Same as in input table | [Column appears once for each specified target_column.] Column for which number of distinct values was estimated. |
| cnt | INTEGER | Approximate cardinality. |
| method | VARCHAR | Method used to calculate approximate cardinality—'approx' (Flajolet-Martin algorithm) or 'nearExact' (counting). |