Function print_schema

pub fn print_schema(out: &mut dyn Write, tp: &Type)

Prints Parquet Type information.

Example

use parquet::{
    basic::{ConvertedType, Repetition, Type as PhysicalType},
    schema::{printer::print_schema, types::Type},
};
use std::sync::Arc;

let field_a = Type::primitive_type_builder("a", PhysicalType::BYTE_ARRAY)
    .with_id(Some(42))
    .with_converted_type(ConvertedType::UTF8)
    .build()
    .unwrap();

let field_b = Type::primitive_type_builder("b", PhysicalType::INT32)
    .with_repetition(Repetition::REQUIRED)
    .build()
    .unwrap();

let field_d = Type::primitive_type_builder("d", PhysicalType::INT64)
    .with_id(Some(99))
    .build()
    .unwrap();

let field_c = Type::group_type_builder("c")
    .with_id(Some(43))
    .with_fields(vec![Arc::new(field_d)])
    .build()
    .unwrap();

let schema = Type::group_type_builder("schema")
    .with_fields(vec![Arc::new(field_a), Arc::new(field_b), Arc::new(field_c)])
    .build()
    .unwrap();

print_schema(&mut std::io::stdout(), &schema);

outputs

message schema {
  OPTIONAL BYTE_ARRAY a [42] (UTF8);
  REQUIRED INT32 b;
  message c [43] {
    OPTIONAL INT64 d [99];
  }
}