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# smallpond.dataframe.Session.wait

Session.wait(*dfs: DataFrame)

  Wait for all DataFrames to be computed.

  ## Example

  This can be used to wait for multiple outputs from a pipeline:

      df = sp.read_parquet("input/*.parquet")
      output1 = df.write_parquet("output1")
      output2 = df.map("col1, col2").write_parquet("output2")
      sp.wait(output1, output2)