DataGrid: Add summary column info (#7944) (#7960)

Author: arman-boyakhchyan

api-reference/10 UI Components/dxDataGrid/1 Configuration/summary/calculateCustomSummary.md

@@ -24,7 +24,7 @@ Indicates the stage of the summary item calculation; equals *"start"*, *"calcula
 The resulting summary item's value.
 
 ##### field(options.value): any
-A column value used to calculate the summary. If you need an entire data object in this field, do not specify the summary item's [column](/api-reference/10%20UI%20Components/dxDataGrid/1%20Configuration/summary/totalItems/column.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/summary/totalItems/#column') property. To display the summary in this case, use the [showInColumn](/api-reference/10%20UI%20Components/dxDataGrid/1%20Configuration/summary/totalItems/showInColumn.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/summary/totalItems/#showInColumn') property instead.
+A cell value. If you do not specify **totalItems[]**.[column](/api-reference/10%20UI%20Components/dxDataGrid/1%20Configuration/summary/totalItems/column.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/summary/totalItems/#column'), the component passes row data objects to this field.
 
 ---
 This is a single function for all custom summary items. Specify a [name](/api-reference/10%20UI%20Components/dxDataGrid/1%20Configuration/summary/totalItems/name.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/summary/totalItems/#name') for each item to identify it in the function.

api-reference/10 UI Components/dxDataGrid/1 Configuration/summary/totalItems/column.md

@@ -3,15 +3,26 @@ id: dxDataGrid.Options.summary.totalItems.column
 ---
 ---
 ##### shortDescription
-Specifies the column that provides data for a summary item.
+Specifies the summary item's data column.
 
 ---
-To provide data for a summary item, assign the [name](/api-reference/_hidden/GridBaseColumn/name.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/columns/#name'), [data field](/api-reference/_hidden/GridBaseColumn/dataField.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/columns/#dataField') or [caption](/api-reference/_hidden/GridBaseColumn/caption.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/columns/#caption') of a column to this property. The summary item will be displayed in the corresponding column. If you require to place the summary item in another column, set the [showInColumn](/api-reference/10%20UI%20Components/dxDataGrid/1%20Configuration/summary/totalItems/showInColumn.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/summary/totalItems/#showInColumn') property for this item.
+To specify the data column of a summary item, assign a column [name](/api-reference/_hidden/GridBaseColumn/name.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/columns/#name'), [data field](/api-reference/_hidden/GridBaseColumn/dataField.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/columns/#dataField') or [caption](/api-reference/_hidden/GridBaseColumn/caption.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/columns/#caption') to this property. DataGrid uses this column's values to calculate the summary item.
+
+The component displays summary items in their corresponding data columns. To display a summary item in another column, configure the [showInColumn](/api-reference/10%20UI%20Components/dxDataGrid/1%20Configuration/summary/totalItems/showInColumn.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/summary/totalItems/#showInColumn') property.
+
+[note]
+
+If you do not specify **column**, note the following specifics:
+
+- The component does not display the summary item if you do not specify **showInColumn**.
+- DataGrid uses row data objects to calculate summaries, which affects calculated values. For instance, the *"max"* [summary type](/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/summary/totalItems/#summaryType) returns "[object Object]".
+
+[/note]
 
 #include btn-open-demo with {
     href: "https://js.devexpress.com/Demos/WidgetsGallery/Demo/DataGrid/GridSummaries/"
 }
 
 #####See Also#####
 - [Total Summary](/concepts/05%20UI%20Components/DataGrid/65%20Summaries/10%20Total%20Summary '/Documentation/Guide/UI_Components/DataGrid/Summaries/Total_Summary/')
-- [calculateCustomSummary](/api-reference/10%20UI%20Components/dxDataGrid/1%20Configuration/summary/calculateCustomSummary.md 'Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/summary/#calculateCustomSummary')
+- [calculateCustomSummary](/api-reference/10%20UI%20Components/dxDataGrid/1%20Configuration/summary/calculateCustomSummary.md '/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/summary/#calculateCustomSummary')