tool: add a tool for updating bundled Apache Arrow

vendor/update_apache_arrow.rb

@@ -0,0 +1,28 @@
+#!/bin/ruby
+
+require 'open-uri'
+require 'yaml'
+
+def apache_arrow_source_dir
+  "apache-arrow-source"
+end
+
+def detect_latest_release_version
+  version_yaml =
+    YAML.load(
+      URI.parse(
+        "https://raw.githubusercontent.com/apache/arrow-site/master/_data/versions.yml"
+      ).read
+    )
+  version_yaml["current"]["number"]
+end
+
+def update_bundled_apache_arrow
+  Dir.chdir(apache_arrow_source_dir) do
+    system("git", "fetch", "--all", "--prune", "--tags", "--force")
+    system("git", "checkout", "apache-arrow-#{detect_latest_release_version}")
+  end
+  system("git", "add", "#{apache_arrow_source_dir}")
+end
+
+update_bundled_apache_arrow