[Release] Update versions for 0.12.2-SNAPSHOT
diff --git a/c_glib/configure.ac b/c_glib/configure.ac
index 02d0c7c..738fcbe 100644
--- a/c_glib/configure.ac
+++ b/c_glib/configure.ac
@@ -17,7 +17,7 @@
 
 AC_PREREQ(2.65)
 
-m4_define([arrow_glib_version], 0.12.1)
+m4_define([arrow_glib_version], 0.12.2-SNAPSHOT)
 AC_INIT([arrow-glib],
         arrow_glib_version,
         [https://issues.apache.org/jira/browse/ARROW],
diff --git a/c_glib/meson.build b/c_glib/meson.build
index 95aade2..e2961ef 100644
--- a/c_glib/meson.build
+++ b/c_glib/meson.build
@@ -23,7 +23,7 @@
           'cpp_std=c++11',
         ])
 
-version = '0.12.1'
+version = '0.12.2-SNAPSHOT'
 if version.endswith('-SNAPSHOT')
   version_numbers = version.split('-')[0].split('.')
   version_tag = version.split('-')[1]
diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index 239cbad..8c91815 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -18,7 +18,7 @@
 cmake_minimum_required(VERSION 3.2)
 message(STATUS "Building using CMake version: ${CMAKE_VERSION}")
 
-set(ARROW_VERSION "0.12.1")
+set(ARROW_VERSION "0.12.2-SNAPSHOT")
 
 string(REGEX MATCH
   "^[0-9]+\\.[0-9]+\\.[0-9]+" ARROW_BASE_VERSION "${ARROW_VERSION}")
diff --git a/matlab/CMakeLists.txt b/matlab/CMakeLists.txt
index 16cf3ab..53779cf 100755
--- a/matlab/CMakeLists.txt
+++ b/matlab/CMakeLists.txt
@@ -18,7 +18,7 @@
 cmake_minimum_required(VERSION 3.2)
 set(CMAKE_CXX_STANDARD 11)
 
-set(MLARROW_VERSION "0.12.1")
+set(MLARROW_VERSION "0.12.2-SNAPSHOT")
 string(REGEX MATCH
   "^[0-9]+\\.[0-9]+\\.[0-9]+" MLARROW_BASE_VERSION "${MLARROW_VERSION}")
 
diff --git a/r/DESCRIPTION b/r/DESCRIPTION
index 887a694..a6ca510 100644
--- a/r/DESCRIPTION
+++ b/r/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: arrow
 Title: R Integration to 'Apache' 'Arrow'
-Version: 0.12.1
+Version: 0.12.1.9000
 Authors@R: c(
     person("Romain", "François", email = "romain@rstudio.com", role = c("aut", "cre")),
     person("Javier", "Luraschi", email = "javier@rstudio.com", role = c("ctb")),
diff --git a/ruby/red-arrow-cuda/lib/arrow-cuda/version.rb b/ruby/red-arrow-cuda/lib/arrow-cuda/version.rb
index 40d91f7..332f0e1 100644
--- a/ruby/red-arrow-cuda/lib/arrow-cuda/version.rb
+++ b/ruby/red-arrow-cuda/lib/arrow-cuda/version.rb
@@ -16,7 +16,7 @@
 # under the License.
 
 module ArrowCUDA
-  VERSION = "0.12.1"
+  VERSION = "0.12.2-SNAPSHOT"
 
   module Version
     numbers, TAG = VERSION.split("-")
diff --git a/ruby/red-arrow/lib/arrow/version.rb b/ruby/red-arrow/lib/arrow/version.rb
index d0a15c7..16a4d33 100644
--- a/ruby/red-arrow/lib/arrow/version.rb
+++ b/ruby/red-arrow/lib/arrow/version.rb
@@ -16,7 +16,7 @@
 # under the License.
 
 module Arrow
-  VERSION = "0.12.1"
+  VERSION = "0.12.2-SNAPSHOT"
 
   module Version
     numbers, TAG = VERSION.split("-")
diff --git a/ruby/red-gandiva/lib/gandiva/version.rb b/ruby/red-gandiva/lib/gandiva/version.rb
index c54528c..7bd5479 100644
--- a/ruby/red-gandiva/lib/gandiva/version.rb
+++ b/ruby/red-gandiva/lib/gandiva/version.rb
@@ -16,7 +16,7 @@
 # under the License.
 
 module Gandiva
-  VERSION = "0.12.1"
+  VERSION = "0.12.2-SNAPSHOT"
 
   module Version
     numbers, TAG = VERSION.split("-")
diff --git a/ruby/red-parquet/lib/parquet/version.rb b/ruby/red-parquet/lib/parquet/version.rb
index 5897d2b..c6189c6 100644
--- a/ruby/red-parquet/lib/parquet/version.rb
+++ b/ruby/red-parquet/lib/parquet/version.rb
@@ -16,7 +16,7 @@
 # under the License.
 
 module Parquet
-  VERSION = "0.12.1"
+  VERSION = "0.12.2-SNAPSHOT"
 
   module Version
     numbers, TAG = VERSION.split("-")
diff --git a/ruby/red-plasma/lib/plasma/version.rb b/ruby/red-plasma/lib/plasma/version.rb
index 4646b5e..c634e7a 100644
--- a/ruby/red-plasma/lib/plasma/version.rb
+++ b/ruby/red-plasma/lib/plasma/version.rb
@@ -16,7 +16,7 @@
 # under the License.
 
 module Plasma
-  VERSION = "0.12.1"
+  VERSION = "0.12.2-SNAPSHOT"
 
   module Version
     numbers, TAG = VERSION.split("-")
diff --git a/rust/arrow/Cargo.toml b/rust/arrow/Cargo.toml
index 6eac694..cbbe1f0 100644
--- a/rust/arrow/Cargo.toml
+++ b/rust/arrow/Cargo.toml
@@ -17,7 +17,7 @@
 
 [package]
 name = "arrow"
-version = "0.12.1"
+version = "0.12.2-SNAPSHOT"
 description = "Rust implementation of Apache Arrow"
 homepage = "https://github.com/apache/arrow"
 repository = "https://github.com/apache/arrow"
diff --git a/rust/parquet/Cargo.toml b/rust/parquet/Cargo.toml
index 65b2eb6..84b9002 100644
--- a/rust/parquet/Cargo.toml
+++ b/rust/parquet/Cargo.toml
@@ -17,7 +17,7 @@
 
 [package]
 name = "parquet"
-version = "0.12.1"
+version = "0.12.2-SNAPSHOT"
 license = "Apache-2.0"
 description = "Apache Parquet implementation in Rust"
 homepage = "https://github.com/apache/arrow"