Replace displayColumn by naming

Switching from using displayColumn to naming in a table is considered a major change.

The usage of displayColumn only makes the protocol incompatible with Cassandra if the displaycolumn value changes.

The displayColumn value is used for storing the trend (and alarm keys). When a display column is updated, this breaks the link to the trend/alarm history.

Impact

Existing trend data is no longer accessible.

DIS MCC

Full ID	Error message	Description
2.15.1	DisplayColumnChangedToNaming	DisplayColumn attribute with column idx '{columnIdx}' on table '{tableId}' was changed into naming options: '{namingValue}'.
2.15.2	DisplayColumnChangeToNamingFormat	DisplayColumn attribute with column idx '{columnIdx}' on table '{tableId}' was changed into NamingFormat: '{namingFormatValue}'.

A request to replace displayColumn with naming to make the protocol Cassandra-compliant is usually approved.

Workarounds

There is no workaround.