Use LimitExpr instead of QueryExpr for limit

lib/clickhouse_ecto/query_string.ex

@@ -1,6 +1,6 @@
 defmodule ClickhouseEcto.QueryString do
   alias Ecto.Query
-  alias Ecto.Query.{BooleanExpr, JoinExpr, QueryExpr}
+  alias Ecto.Query.{BooleanExpr, JoinExpr, QueryExpr, LimitExpr}
   alias ClickhouseEcto.Connection
   alias ClickhouseEcto.Helpers
 
@@ -93,6 +93,7 @@ defmodule ClickhouseEcto.QueryString do
   def on_join_expr({:==, _, [{{_, _, [_, column]}, _, _}, _]}) when is_atom(column) do
     " USING " <> Atom.to_string(column)
   end
+
   def on_join_expr(true), do: ""
 
   def join_qual(:inner), do: " INNER JOIN "
@@ -144,7 +145,7 @@ defmodule ClickhouseEcto.QueryString do
 
   def limit(%Query{limit: nil}, _sources), do: []
 
-  def limit(%Query{limit: %QueryExpr{expr: expr}} = query, sources) do
+  def limit(%Query{limit: %LimitExpr{expr: expr}} = query, sources) do
     [" LIMIT ", expr(expr, sources, query)]
   end
 
@@ -155,15 +156,19 @@ defmodule ClickhouseEcto.QueryString do
   end
 
   defp hints([_ | _] = hints) do
-    hint_list = Enum.map(hints, &hint/1)
-    |> Enum.intersperse(", ")
+    hint_list =
+      Enum.map(hints, &hint/1)
+      |> Enum.intersperse(", ")
 
     [" ", hint_list]
   end
+
   defp hints([]), do: []
 
   defp hint(hint_str) when is_binary(hint_str), do: hint_str
-  defp hint({key, val}) when is_atom(key) and is_integer(val), do: [Atom.to_string(key), " ", Integer.to_string(val)]
+
+  defp hint({key, val}) when is_atom(key) and is_integer(val),
+    do: [Atom.to_string(key), " ", Integer.to_string(val)]
 
   def boolean(_name, [], _sources, _query), do: []
 

mix.exs

@@ -4,7 +4,7 @@ defmodule ClickhouseEcto.Mixfile do
   def project do
     [
       app: :clickhouse_ecto,
-      version: "0.2.8",
+      version: "0.2.9",
       elixir: "~> 1.5",
       start_permanent: Mix.env() == :prod,
       deps: deps(),