handle atttypmod being correct for decimals from v22.1

lib/active_record/connection_adapters/cockroachdb_adapter.rb

@@ -206,6 +206,10 @@ def supports_string_to_array_coercion?
         @crdb_version >= 2020
       end
 
+      def needs_numeric_override?
+        @crdb_version < 2210
+      end
+
       def supports_partitioned_indexes?
         false
       end
@@ -232,7 +236,7 @@ def initialize(connection, logger, conn_params, config)
         if crdb_version_string.include? "v1."
           version_num = 1
         elsif crdb_version_string.include? "v2."
-          version_num 2
+          version_num = 2
         elsif crdb_version_string.include? "v19.1."
           version_num = 1910
         elsif crdb_version_string.include? "v19.2."
@@ -245,8 +249,10 @@ def initialize(connection, logger, conn_params, config)
           version_num = 2110
         elsif crdb_version_string.include? "v21.2.0"
           version_num = 2120
-        else
+        elsif crdb_version_string.include? "v21.2."
           version_num = 2121
+        else
+          version_num = 2210
         end
         @crdb_version = version_num
 
@@ -291,21 +297,23 @@ def initialize_type_map(m = type_map)
           # Once that PR is merged, we can call super at the top.
           super(m)
 
-          # Override numeric type. This is almost identical to the default,
+          # Override numeric type pre-22.1. This is almost identical to the default,
           # except that the conditional based on the fmod is changed.
-          m.register_type "numeric" do |_, fmod, sql_type|
-            precision = extract_precision(sql_type)
-            scale = extract_scale(sql_type)
-
-            # If fmod is -1, that means that precision is defined but not
-            # scale, or neither is defined.
-            if fmod && fmod == -1 && !precision.nil?
-              # Below comment is from ActiveRecord
-              # FIXME: Remove this class, and the second argument to
-              # lookups on PG
-              Type::DecimalWithoutScale.new(precision: precision)
-            else
-              OID::Decimal.new(precision: precision, scale: scale)
+          if needs_numeric_override?
+            m.register_type "numeric" do |_, fmod, sql_type|
+              precision = extract_precision(sql_type)
+              scale = extract_scale(sql_type)
+
+              # If fmod is -1, that means that precision is defined but not
+              # scale, or neither is defined.
+              if fmod && fmod == -1 && !precision.nil?
+                # Below comment is from ActiveRecord
+                # FIXME: Remove this class, and the second argument to
+                # lookups on PG
+                Type::DecimalWithoutScale.new(precision: precision)
+              else
+                OID::Decimal.new(precision: precision, scale: scale)
+              end
             end
           end
         end