kou commented on code in PR #48699:
URL: https://github.com/apache/arrow/pull/48699#discussion_r2656162122


##########
ruby/red-arrow/lib/arrow/array-builder.rb:
##########
@@ -186,6 +199,34 @@ def create_builder(builder_info)
           data_type = Decimal256DataType.new(builder_info[:precision],
                                              builder_info[:scale])
           Decimal256ArrayBuilder.new(data_type)
+        when :int
+          required_bit_length = builder_info[:bit_length] + 1

Review Comment:
   Or how about computing it from `min` and `max`?
   
   ```ruby
   when :int
     min = builder_info[:min]
     max = builder_info[:max]
     if GLib::MININT8 <= min and max <= GLib::MAXINT8
       Int8ArrayBuilder.new
     elsif GLib::MININT16 <= min and max <= GLib::MAXINT16
       Int16ArrayBuilder.new
     ...
     else
        StringArrayBuilder.new
     end
   end
   ```



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