[Data Grid] prevent off-page rendering

[PhaedrusTheGreek]

Given the CodeSandbox example for "Pagination only in-memory", if you put a console.log(rowIndex) in the renderer, you'll see that the entire dataset (all 100 rows) are rendered initially, even though the page size is 10.

[myasonik]

I couldn't actually find an open ticket for it but this work is already in progress!

#4170

[chandlerprall]

I couldn't actually find an open ticket for it but this work is already in progress!

Distinction between the virtualization & this reported off-page rendering. When setting the datagrid's inmemory prop to pagination or sorting, every cell will be rendered off screen. This enables the inmemory sorting to work, as rendering those cells & inspecting their values is the only way the grid can access the cell values. I don't remember why setting the inmemory level to pagination does the same, it doesn't seem like knowing those values would be required.

[chandlerprall]

Looking/thinking through this more, it is working as intended. When in-memory level is pagination that means all of the data is available for in-memory rendering, and using that full data set to determine the column schema is more accurate than artificially limiting the rows used for detecting a schema.