assertAddOnly
The assertAddOnly method returns a copy of the source table or the source table itself if it is already an add-only table, with the add-only attribute set.
The source table's update pattern must already conform to add-only semantics. If it produces an update that does not conform to add-only semantics, then the returned table will notify of an error and cease updating.
If the engine can identify a table as add only, then some query operations may be optimized (for example, a lastBy operation need only track the current last row per-group rather than all of the rows in a group). In formulas, the k variable (for the current row key) can be used safely.
Syntax
table.assertAddOnly()
Parameters
This method takes no arguments.
Returns
A new Table with the add-only attribute set.