chore: add migrate operation interface

cmd/signozschemamigrator/schema_migrator/op.go

@@ -0,0 +1,35 @@
+package schemamigrator
+
+// Operation is the interface that all operations must implement.
+// An Operation that is not mutation, idempotent and lightweight is expected
+// to complete almost immediately given there are no blocking items in the
+// distributed_ddl_queue.
+// Such operations are completed synchronously and allow the release upgrade
+// to proceed.
+// All other operations are run asynchronously in the background and do not
+// block the release upgrade.
+type Operation interface {
+	// ToSQL returns the SQL for the alter operation
+	ToSQL() string
+	// IsMutation returns true if the operation is a mutation
+	IsMutation() bool
+	// IsIdempotent returns true if the operation is idempotent
+	// This is used to determine if the operation can be retried in case of a
+	// failure.
+	IsIdempotent() bool
+	// IsLightweight returns true if the operation is lightweight
+	// The lightweight operations are the ones that either modify the metadata or
+	// drop the delete from disk as opposed to the ones that re-write the whole
+	// data parts.
+	IsLightweight() bool
+
+	// OnCluster returns a new operation with the cluster name set
+	// This is used when the operation is run on a specific cluster
+	OnCluster(string) Operation
+
+	// WithReplication returns a new operation with the replication set
+	WithReplication() Operation
+
+	// ShouldWaitForDistributionQueue returns true if the operation should wait for the distribution queue to be empty
+	ShouldWaitForDistributionQueue() (bool, string, string)
+}