diff --git a/lib/ecto/adapters/clickhouse/connection.ex b/lib/ecto/adapters/clickhouse/connection.ex
index b9f00f07..aee774c9 100644
--- a/lib/ecto/adapters/clickhouse/connection.ex
+++ b/lib/ecto/adapters/clickhouse/connection.ex
@@ -4,7 +4,6 @@ defmodule Ecto.Adapters.ClickHouse.Connection do
   @behaviour Ecto.Adapters.SQL.Connection
   @dialyzer :no_improper_lists
 
-  require Logger
   alias Ecto.SubQuery
   alias Ecto.Query.{QueryExpr, ByExpr, JoinExpr, BooleanExpr, WithExpr, Tagged}
 
diff --git a/lib/mix/tasks/schema.ex b/lib/mix/tasks/schema.ex
index 7a7dd5db..6aeec3fa 100644
--- a/lib/mix/tasks/schema.ex
+++ b/lib/mix/tasks/schema.ex
@@ -15,8 +15,8 @@ defmodule Mix.Tasks.Ecto.Ch.Schema do
     IO.puts(@moduledoc)
   end
 
-  def run(["-" <> _k | _] = kvs) do
-    run(_source = nil, kvs)
+  def run(["-" <> _k | _]) do
+    run([])
   end
 
   def run([source | kvs]) do