group_by

Columns to group by. An array specifying the columns used for grouping. The by parameter can be either:

• An array of column names (e.g., ["column1", "column2"]), which defaults to EXACT grouping.
• An array of objects with columnName, groupingType, and optional param properties.

Aggregation functions to apply. An array specifying the aggregation functions to apply on each group. The array can be empty, in which case no aggregations are performed, but the dataset is still grouped by the specified columns.

The graphext advanced query used to identify the rows to select previous to the grouping.