dialect/entsql: add entsql annotation (#876)

dialect/entsql/annotation.go

@@ -0,0 +1,27 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+package entsql
+
+import "github.com/facebook/ent/schema"
+
+// Annotation is a builtin schema annotation for attaching
+// SQL metadata to schema objects for both codegen and runtime.
+type Annotation struct {
+	// The Table option allows overriding the default table
+	// name that is generated by ent. For example:
+	//
+	//	entsql.Annotation{
+	//		Table: "Users",
+	//	}
+	//
+	Table string
+}
+
+// Name describes the annotation name.
+func (Annotation) Name() string {
+	return "EntSQL"
+}
+
+var _ schema.Annotation = (*Annotation)(nil)