Github user hyunsik commented on a diff in the pull request:
https://github.com/apache/tajo/pull/1017#discussion_r63986923
--- Diff: tajo-common/src/main/java/org/apache/tajo/type/Type.java ---
@@ -36,6 +36,7 @@
// No paramter types
public static final Any Any = new Any();
+ public static final Bit Bit = new Bit();
--- End diff --
IMO, the main difference between singleton with (typical) ``getInstance``
method and ```static final``` variable is the initialization time. Singleton
pattern is preferred if the variable needs to be initialized lazily. Static
variable is initialized at class loading. In this case, they are always used
throughout a system. So, IMO, static variable is also right choice here. In
addition, static variable provides more concise usages.
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