Function print_empty

datafusion-cli/src/print_format.rs:227–256

()

    #[test]
    fn print_empty() {
        for format in [
            PrintFormat::Csv,
            PrintFormat::Tsv,
            PrintFormat::Json,
            PrintFormat::NdJson,
            PrintFormat::Automatic,
        ] {
            // no output for empty batches, even with header set
            let output = PrintBatchesTest::new()
                .with_format(format)
                .with_schema(three_column_schema())
                .with_batches(vec![])
                .run();
            assert_eq!(output, "")
        }

        // output column headers for empty batches when format is Table
        let output = PrintBatchesTest::new()
            .with_format(PrintFormat::Table)
            .with_schema(three_column_schema())
            .with_batches(vec![])
            .run();
        assert_snapshot!(output, @r"
        +---+---+---+
        | a | b | c |
        +---+---+---+
        +---+---+---+
        ");
    }

    #[test]
    fn print_csv_no_header() {