DataGrid - Performance is slow if a large number of summaries is used (T1316562)

[dmirgaev]

No description provided.

[Copilot]

Pull request overview

Improves DataGrid group summary performance by avoiding repeated columnsController.columnOption(...) lookups when many summary items are configured (T1316562), replacing them with a precomputed column lookup Map.

Changes:

• Added a cached column lookup map built once per group-items processing cycle and reused during summary cell calculation.
• Introduced internal summary types (SummaryItem, ColumnMap) and a small map lookup helper.
• Added Jest unit + integration coverage for the new utilities and the performance optimization.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/devextreme/js/__internal/grids/data_grid/summary/utils.ts	Adds getColumnFromMap helper for map-based column lookup.
packages/devextreme/js/__internal/grids/data_grid/summary/types.ts	Adds internal SummaryItem and ColumnMap typings for the optimization.
packages/devextreme/js/__internal/grids/data_grid/summary/m_summary.ts	Builds and reuses a column lookup map to reduce repeated columnOption calls during group summary rendering.
packages/devextreme/js/__internal/grids/data_grid/summary/tests/utils.test.ts	Adds unit tests for getSummaryCellIndex and getColumnFromMap.
packages/devextreme/js/__internal/grids/data_grid/summary/tests/m_summary.integration.test.ts	Adds an integration test asserting fewer columnOption calls on refresh with many group summaries.

[Copilot]

Pull request overview

This PR introduces a column lookup map to speed up DataGrid group summary processing when many summary items are configured, reducing repeated columnOption lookups during group row rendering/refresh.

Changes:

• Added a ColumnMap lookup mechanism and helper (getColumnFromMap) to avoid repeated columnOption calls.
• Implemented _buildColumnLookupMap() and routed group summary cell calculation through the map.
• Added Jest unit tests for summary utils and an integration test to validate the optimization behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/devextreme/js/__internal/grids/data_grid/summary/utils.ts	Adds getColumnFromMap helper for map-based column resolution.
packages/devextreme/js/__internal/grids/data_grid/summary/types.ts	Introduces SummaryItem and ColumnMap types used by the optimization.
packages/devextreme/js/__internal/grids/data_grid/summary/m_summary.ts	Builds/passes a column lookup map into group summary cell calculation to reduce columnOption calls.
packages/devextreme/js/__internal/grids/data_grid/summary/__tests__/utils.test.ts	Adds unit coverage for getSummaryCellIndex and getColumnFromMap.
packages/devextreme/js/__internal/grids/data_grid/summary/__tests__/m_summary.integration.test.ts	Adds an integration test asserting fewer columnOption calls on refresh with many summaries.