alignByColumn
Indicates whether to display group summary items in parentheses after the group row header or to align them by the corresponding columns within the group row.
showInColumn
Specifies the column that must hold the summary item when this item is displayed in the group footer or aligned by a column in the group row.
skipEmptyValues
Specifies whether to skip empty strings, null, and undefined values when calculating a summary. Does not apply when you use a remote data source.
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