Add support for integer limits in map type (#178)

Author: danielwestendorf

lib/active_record/connection_adapters/clickhouse/oid/map.rb

@@ -7,15 +7,16 @@ module OID # :nodoc:
         class Map < Type::Value # :nodoc:
 
           def initialize(sql_type)
-            @subtype = case sql_type
-                       when /U?Int\d+/
-                         :integer
-                       when /DateTime/
-                         :datetime
-                       when /Date/
-                         :date
-                       else
-                         :string
+            case sql_type
+            when /U?Int(\d+)/
+              @subtype = :integer
+              @limit = bits_to_limit(Regexp.last_match(1)&.to_i)
+            when /DateTime/
+              @subtype = :datetime
+            when /Date/
+              @subtype = :date
+            else
+              @subtype = :string
             end
           end
 
@@ -65,6 +66,19 @@ def serialize(value)
             end
           end
 
+          private
+
+          def bits_to_limit(bits)
+            case bits
+            when 8   then 1
+            when 16  then 2
+            when 32  then 4
+            when 64  then 8
+            when 128 then 16
+            when 256 then 32
+            end
+          end
+
         end
       end
     end

lib/active_record/connection_adapters/clickhouse/table_definition.rb

@@ -102,7 +102,7 @@ def column(name, type, index: nil, **options)
         private
 
         def valid_column_definition_options
-          super + [:array, :low_cardinality, :fixed_string, :value, :type, :map, :codec]
+          super + [:array, :low_cardinality, :fixed_string, :value, :type, :map, :codec, :unsigned]
         end
       end
 

lib/active_record/connection_adapters/clickhouse_adapter.rb

@@ -191,6 +191,8 @@ def extract_limit(sql_type) # :nodoc:
               nil
             when /(Nullable)?\(?U?Int64\)?/
               8
+            when /(Nullable)?\(?U?Int128\)?/
+              16
             else
               super
           end