//! Quick test to inspect Parquet schema
use parquet::arrow::arrow_reader::ParquetRecordBatchReaderBuilder;
use std::fs::File;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let file = File::open("test_data/ES_FUT_180d.parquet")?;
    let builder = ParquetRecordBatchReaderBuilder::try_new(file)?;
    let reader = builder.build()?;

    // Get the first batch to inspect schema
    if let Some(batch_result) = reader.into_iter().next() {
        let batch = batch_result?;
        println!("Schema: {:?}", batch.schema());
        println!("\nColumn 0 (timestamp):");
        println!("  Data type: {:?}", batch.column(0).data_type());
        println!("  Null count: {}", batch.column(0).null_count());
        println!("  Length: {}", batch.column(0).len());

        // Try to print first few values
        println!("\nFirst 3 values:");
        use arrow::array::Array;
        let col = batch.column(0);
        println!("  Value type: {}", std::any::type_name_of_val(&col));
    }

    Ok(())
}