samples: Schema evolution

samples/snippets/resources/us-states-plus.avsc

@@ -0,0 +1,24 @@
+{
+  "type":"record",
+  "name":"State",
+  "namespace":"utilities",
+  "doc":"A list of states in the United States of America.",
+  "fields":[
+    {
+      "name":"name",
+      "type":"string",
+      "doc":"The common name of the state."
+    },
+    {
+      "name":"post_abbr",
+      "type":"string",
+      "doc":"The postal code abbreviation of the state."
+    },
+    {
+      "name":"population",
+      "type":"long",
+      "default":0,
+      "doc":"The population of the state."
+    }
+  ]
+}

samples/snippets/resources/us-states-plus.proto

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+syntax = "proto3";
+
+package utilities;
+
+message StateProto {
+  string name = 1;
+  string post_abbr = 2;
+  int64 population = 3;
+}