The row type.
Where rows come from. Memoise it, or every render refetches.
Active filters, keyed by column id.
OptionalmaxBlocks to keep around so paging back and forth does not refetch.
OptionalonCalled when a fetch throws. Aborted requests are not reported.
Zero-based page index.
Rows per page.
OptionalrowThe grouping column, sent as HxRowsRequest.rowGroupCols. When it
holds an entry the rows fetched are group rows and totalRows counts
groups.
Active sorts, primary first.
OptionalvalueAggregates wanted on group rows, sent as HxRowsRequest.valueCols.
Options for useServerDataSource.