Increment MetadataVersion in flatbuffer

Change-Id: Id6a5ee0d9c716fcbf92c452b51a249595bc0f90d

cpp/src/arrow/ipc/ipc-metadata-test.cc

@@ -111,7 +111,7 @@ class TestFileFooter : public ::testing::Test {
     std::unique_ptr<FileFooter> footer;
     ASSERT_OK(FileFooter::Open(buffer, &footer));
 
-    ASSERT_EQ(MetadataVersion::V1_SNAPSHOT, footer->version());
+    ASSERT_EQ(MetadataVersion::V2, footer->version());
 
     // Check schema
     std::shared_ptr<Schema> schema2;

cpp/src/arrow/ipc/metadata-internal.h

@@ -44,8 +44,7 @@ using FieldOffset = flatbuffers::Offset<arrow::flatbuf::Field>;
 using VectorLayoutOffset = flatbuffers::Offset<arrow::flatbuf::VectorLayout>;
 using Offset = flatbuffers::Offset<void>;
 
-static constexpr flatbuf::MetadataVersion kMetadataVersion =
-    flatbuf::MetadataVersion_V1_SNAPSHOT;
+static constexpr flatbuf::MetadataVersion kMetadataVersion = flatbuf::MetadataVersion_V2;
 
 Status FieldFromFlatbuffer(const flatbuf::Field* field, std::shared_ptr<Field>* out);
 

cpp/src/arrow/ipc/metadata.cc

@@ -281,11 +281,13 @@ class FileFooter::FileFooterImpl {
 
   MetadataVersion::type version() const {
     switch (footer_->version()) {
-      case flatbuf::MetadataVersion_V1_SNAPSHOT:
-        return MetadataVersion::V1_SNAPSHOT;
+      case flatbuf::MetadataVersion_V1:
+        return MetadataVersion::V1;
+      case flatbuf::MetadataVersion_V2:
+        return MetadataVersion::V2;
       // Add cases as other versions become available
       default:
-        return MetadataVersion::V1_SNAPSHOT;
+        return MetadataVersion::V2;
     }
   }
 

cpp/src/arrow/ipc/metadata.h

@@ -42,7 +42,7 @@ class OutputStream;
 namespace ipc {
 
 struct MetadataVersion {
-  enum type { V1_SNAPSHOT };
+  enum type { V1, V2 };
 };
 
 //----------------------------------------------------------------------

format/Message.fbs

@@ -18,7 +18,8 @@
 namespace org.apache.arrow.flatbuf;
 
 enum MetadataVersion:short {
-  V1_SNAPSHOT
+  V1,
+  V2
 }
 
 /// ----------------------------------------------------------------------