[I] How to write csv file to disk from a empty dataframe? [datafusion]

[via GitHub]

mmooyyii opened a new issue, #16240:
URL: https://github.com/apache/datafusion/issues/16240

   I want write a csv file only include headers;
   
   ```
   use datafusion::config::CsvOptions;
   use datafusion::dataframe::DataFrameWriteOptions;
   use datafusion::error::Result;
   use datafusion::prelude::*;
   use std::path::Path;
   
   #[tokio::main]
   async fn main() -> Result<()> {
       let ctx = SessionContext::new();
   
       let df = ctx.sql("SELECT 1 limit 0").await?;
   
       let mut cfg1 = DataFrameWriteOptions::new();
       cfg1 = cfg1.with_single_file_output(true);
   
       let mut cfg2 = CsvOptions::default();
       cfg2.has_header = Some(true);
   
       df.write_csv("/tmp/t.csv", cfg1, Some(cfg2)).await?;
       assert_eq!(Path::new("/tmp/t.csv").exists(), true);  // panic!
       Ok(())
   }
   ```


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