diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
index e46e47102b33f..2a651598925d0 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
@@ -7,7 +7,11 @@ module OID # :nodoc:
         class Array < Type::Value # :nodoc:
           include ActiveModel::Type::Helpers::Mutable
 
-          Data = Struct.new(:encoder, :values) # :nodoc:
+          Data = Struct.new(:encoder, :values) do # :nodoc:
+            def hash
+              [encoder.name, encoder.delimiter, values].hash
+            end
+          end
 
           attr_reader :subtype, :delimiter
           delegate :type, :user_input_in_time_zone, :limit, :precision, :scale, to: :subtype
diff --git a/activerecord/lib/arel/visitors/postgresql.rb b/activerecord/lib/arel/visitors/postgresql.rb
index 69aab80c8e1df..0762ea0d8aa73 100644
--- a/activerecord/lib/arel/visitors/postgresql.rb
+++ b/activerecord/lib/arel/visitors/postgresql.rb
@@ -78,6 +78,36 @@ def visit_Arel_Nodes_IsDistinctFrom(o, collector)
           visit o.right, collector
         end
 
+        def visit_Arel_Nodes_NullsFirst(o, collector)
+          visit o.expr, collector
+          collector << " NULLS FIRST"
+        end
+
+        def visit_Arel_Nodes_NullsLast(o, collector)
+          visit o.expr, collector
+          collector << " NULLS LAST"
+        end
+
+        # Postgres-specific implementation that uses `col = any('{1,2}')` instead of `col IN (1,2)`
+        # to avoid pg_stat_statements churn
+        def visit_Arel_Nodes_HomogeneousIn(o, collector)
+          oid = ActiveRecord::ConnectionAdapters::PostgreSQL::OID
+          case o.attribute.type_caster
+          when oid::Bytea, oid::Jsonb
+            return super
+          end
+
+          visit o.left, collector
+          collector << (o.type == :in ? " = any(" : " != all(")
+
+          type_caster = oid::Array.new(o.attribute.type_caster, ",")
+          values = [type_caster.serialize(o.casted_values)]
+          proc_for_binds = -> value { ActiveModel::Attribute.with_cast_value(o.attribute.name, value, type_caster) }
+          collector.add_binds(values, proc_for_binds, &bind_block)
+
+          collector << ")"
+        end
+
         BIND_BLOCK = proc { |i| "$#{i}" }
         private_constant :BIND_BLOCK