From 571653184fc16ca705c5f284f1d4ba8a22ad23bf Mon Sep 17 00:00:00 2001
From: Tim Meehan <tdm@fb.com>
Date: Sun, 19 May 2019 21:40:06 -0700
Subject: [PATCH] Add Experimental annotation in SPI

---
 .../facebook/presto/spi/api/Experimental.java | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 presto-spi/src/main/java/com/facebook/presto/spi/api/Experimental.java

diff --git a/presto-spi/src/main/java/com/facebook/presto/spi/api/Experimental.java b/presto-spi/src/main/java/com/facebook/presto/spi/api/Experimental.java
new file mode 100644
index 0000000000000..ee5b6f3f8d612
--- /dev/null
+++ b/presto-spi/src/main/java/com/facebook/presto/spi/api/Experimental.java
@@ -0,0 +1,43 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.facebook.presto.spi.api;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Indicates a public API that can change at any time, and has no guarantee of API stability and
+ * backward-compatibility.
+ *
+ * <p>Usage guidelines:
+ * <ol>
+ * <li>This annotation is used only on public API. Internal interfaces should not use it.</li>
+ * <li>This annotation should only be added to new APIs. Adding it to an existing API is
+ * considered API-breaking.</li>
+ * <li>Removing this annotation from an API gives it stable status.</li>
+ * </ol>
+ */
+@Retention(RetentionPolicy.SOURCE)
+@Target({ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.FIELD, ElementType.METHOD, ElementType.PACKAGE, ElementType.TYPE})
+@Documented
+public @interface Experimental
+{
+    /**
+     * Context information such as links to discussion thread, tracking issue etc.
+     */
+    String value() default "";
+}