ConstReadonlyCANCELLED: "CANCELLED"The operation was cancelled.
ReadonlyFAILED: "FAILED"The operation failed.
ReadonlyPENDING: "PENDING"The operation is pending.
ReadonlyRUNNING: "RUNNING"The operation is running.
ReadonlySTATE_UNSPECIFIED: "STATE_UNSPECIFIED"The state is unspecified.
ReadonlySUCCEEDED: "SUCCEEDED"The operation succeeded.
Lifecycle state of a materialization set operation.