Support endless ranges in where

This commit adds support for endless ranges, e.g. (1..), that were added
in Ruby 2.6. They're functionally equivalent to explicitly specifying
Float::INFINITY as the end of the range.

1 files changed, 12 insertions, 0 deletions

diff --git a/activerecord/test/cases/arel/attributes/attribute_test.rb b/activerecord/test/cases/arel/attributes/attribute_test.rb
index 671e273543..6ad54ab5df 100644
--- a/activerecord/test/cases/arel/attributes/attribute_test.rb
+++ b/activerecord/test/cases/arel/attributes/attribute_test.rb
@@ -639,6 +639,18 @@ module Arel
           )
         end
 
+        if Gem::Version.new("2.6.0") <= Gem::Version.new(RUBY_VERSION)
+          it "can be constructed with a range implicitly ending at Infinity" do
+            attribute = Attribute.new nil, nil
+            node = attribute.between(eval("0..")) # Use eval for compatibility with Ruby < 2.6 parser
+
+            node.must_equal Nodes::GreaterThanOrEqual.new(
+              attribute,
+              Nodes::Casted.new(0, attribute)
+            )
+          end
+        end
+
         it "can be constructed with a quoted range ending at Infinity" do
           attribute = Attribute.new nil, nil
           node = attribute.between(quoted_range(0, ::Float::INFINITY, false))