Add support for range operators (#938)

src/PostgREST/QueryBuilder.hs

@@ -417,7 +417,9 @@ pgFmtFilter table (Filter fld (Operation hasNot_ ex)) = notOp <> " " <> case ex
    (op, VText val) -> pgFmtFieldOp op <> " " <> case op of
      "like"  -> unknownLiteral (T.map star val)
      "ilike" -> unknownLiteral (T.map star val)
+     -- TODO: The '@@' was deprecated, remove in v0.5.0.0
      "@@"    -> "to_tsquery(" <> unknownLiteral val <> ") "
+     "fts"   -> "to_tsquery(" <> unknownLiteral val <> ") "
      "is"    -> whiteList val
      "isnot" -> whiteList val
      _       -> unknownLiteral val

src/PostgREST/Types.hs

@@ -161,6 +161,16 @@ operators = M.fromList [
   ("notin", "NOT IN"),
   ("isnot", "IS NOT"),
   ("is", "IS"),
+  ("fts", "@@"),
+  ("cs", "@>"),
+  ("cd", "<@"),
+  ("ov", "&&"),
+  ("sl", "<<"),
+  ("sr", ">>"),
+  ("nxr", "&<"),
+  ("nxl", "&>"),
+  ("adj", "-|-"),
+  -- TODO: these are deprecated and should be removed in v0.5.0.0
   ("@@", "@@"),
   ("@>", "@>"),
   ("<@", "<@")]