Add support for selecting by column

src/PostgREST/Types.hs

@@ -106,10 +106,10 @@ type Cast = Text
 type NodeName = Text
 type SelectItem = (Field, Maybe Cast)
 type Path = [Text]
-data ReadQuery = Select { select::[SelectItem], from::[Text], flt_::[Filter], order::Maybe [OrderTerm] }  deriving (Show, Eq)
-data MutateQuery = Insert { in_::Text, qPayload::Payload }
-                 | Delete { in_::Text, where_::[Filter] }
-                 | Update { in_::Text, qPayload::Payload, where_::[Filter] } deriving (Show, Eq)
+data ReadQuery = Select { select::[SelectItem], from::[TableName], flt_::[Filter], order::Maybe [OrderTerm] } deriving (Show, Eq)
+data MutateQuery = Insert { in_::TableName, qPayload::Payload }
+                 | Delete { in_::TableName, where_::[Filter] }
+                 | Update { in_::TableName, qPayload::Payload, where_::[Filter] } deriving (Show, Eq)
 data Filter = Filter {field::Field, operator::Operator, value::FValue} deriving (Show, Eq)
 type ReadNode = (ReadQuery, (NodeName, Maybe Relation))
 type ReadRequest = Tree ReadNode