Merge pull request #550 from HazyResearch/raphael_pgtsvnull

Adds support for null values in int/float columns in pgtsv_to_json; a…

database/pgtsv_to_json

@@ -48,7 +48,8 @@ def convert_type_func(ty, ty_rest = ""):
     else:
       def convert_other_array(value):
         arr = csv.reader([value[1:-1]], delimiter=',', quotechar='"').next()
-        return map(convert, arr)
+        convert_or_null = lambda x: None if x == 'NULL' else convert(x)
+        return map(convert_or_null, arr)
       return convert_other_array
   else: # non-array, must be primitive type
     normalized_type_name = {
@@ -57,6 +58,8 @@ def convert_type_func(ty, ty_rest = ""):
         "bigint"  : "int",
         "double"  : "float",
         "numeric" : "float",
+        "real"    : "float",
+        "double precision" : "float",
         "unknown" : "text",
         }
     convert_for_primitive_types = {