Make name public, expose plain SQL run

Author: jberkel

Sources/SQLite/Schema/SchemaChanger.swift

@@ -100,7 +100,7 @@ public class SchemaChanger: CustomStringConvertible {
     public class AlterTableDefinition {
         fileprivate var operations: [Operation] = []
 
-        let name: String
+        public let name: String
 
         init(name: String) {
             self.name = name
@@ -223,6 +223,11 @@ public class SchemaChanger: CustomStringConvertible {
         try connection.run("ALTER TABLE \(table.quote()) RENAME TO \(to.quote())")
     }
 
+    // Runs arbitrary SQL. Should only be used if no predefined operations exist.
+    public func run(sql: String) throws {
+        try connection.run(sql)
+    }
+
     private func run(table: String, operation: Operation) throws {
         try operation.validate()