Function alter_changes_reconfiguration_target 

fn alter_changes_reconfiguration_target(options: &PlanClusterOption) -> bool

Whether an ALTER statement sets a reconfiguration target dimension.

A statement-level check, used while a reconfiguration is in flight: an ALTER back to the realized configuration sets an option without changing its value, yet must reach the reshape path to cancel the record. All target dimensions, including replication factor, must update the in-flight target rather than the realized config so cut-over does not overwrite them. With nothing in flight the routing compares shapes instead (see sequence_alter_cluster_stage).