ApproxPercentileReduce Output Table Schema
| Column | Data Type | Description |
|---|---|---|
| group_column | Same as in input table | [Column appears once for each specified group_column.] Column by which to group data. |
| percentile | INTEGER | With GroupColumns argument, approximate percentile of group; otherwise, entire column. |
| value | DOUBLE PRECISION | Value of percentile, correct within error%. |