From b5302d5a820b078b6488104dd695a679e5a49623 Mon Sep 17 00:00:00 2001
From: Dmytro Shteflyuk <kpumuk@kpumuk.info>
Date: Thu, 15 Nov 2018 14:49:55 -0500
Subject: Arel: Implemented DB-aware NULL-safe comparison (#34451)
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* Arel: Implemented DB-aware NULL-safe comparison

* Fixed where clause inversion for NULL-safe comparison

* Renaming "null_safe_eq" to "is_not_distinct_from", "null_safe_not_eq" to "is_distinct_from"

[Dmytro Shteflyuk + Rafael Mendonça França]
---
 activerecord/lib/arel/nodes/equality.rb | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'activerecord/lib/arel/nodes')

diff --git a/activerecord/lib/arel/nodes/equality.rb b/activerecord/lib/arel/nodes/equality.rb
index 2aa85a977e..551d56c2ff 100644
--- a/activerecord/lib/arel/nodes/equality.rb
+++ b/activerecord/lib/arel/nodes/equality.rb
@@ -7,5 +7,12 @@ module Arel # :nodoc: all
       alias :operand1 :left
       alias :operand2 :right
     end
+
+    %w{
+      IsDistinctFrom
+      IsNotDistinctFrom
+    }.each do |name|
+      const_set name, Class.new(Equality)
+    end
   end
 end
-- 
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