Revert LazyFrame implementation with stack (#892)

This is because we could make the remaining group operations work without having to deal with the stack in any special way. It's a revert of #882
elixir-explorer · Apr 11, 2024 · 5167342 · 5167342
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commit 5167342
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diff --git a/lib/explorer/polars_backend/data_frame.ex b/lib/explorer/polars_backend/data_frame.ex
@@ -501,7 +501,7 @@ defmodule Explorer.PolarsBackend.DataFrame do
   def lazy(df) do
     case Native.df_lazy(df.data) do
       {:ok, polars_df} ->
-        %{df | data: struct!(lazy(), frame: polars_df)}
+        %{df | data: polars_df}
 
       {:error, error} ->
         raise "error when assigning lazy frame: #{inspect(error)}"