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ARROW-10095: [Rust] Update rust-parquet-arrow-writer branch's encode_arrow_schema with ipc changes #8274

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ARROW-10095: [Rust] Update rust-parquet-arrow-writer branch's encode_arrow_schema with ipc changes #8274

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8 changes: 5 additions & 3 deletions rust/parquet/src/arrow/schema.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ use std::collections::{HashMap, HashSet};
use std::rc::Rc;

use arrow::datatypes::{DataType, DateUnit, Field, Schema, TimeUnit};
use arrow::ipc::writer;

use crate::basic::{LogicalType, Repetition, Type as PhysicalType};
use crate::errors::{ParquetError::ArrowError, Result};
Expand Down Expand Up @@ -120,15 +121,16 @@ fn get_arrow_schema_from_metadata(encoded_meta: &str) -> Option<Schema> {

/// Encodes the Arrow schema into the IPC format, and base64 encodes it
fn encode_arrow_schema(schema: &Schema) -> String {
let mut serialized_schema = arrow::ipc::writer::schema_to_bytes(&schema);
let options = writer::IpcWriteOptions::default();
let mut serialized_schema = arrow::ipc::writer::schema_to_bytes(&schema, &options);

// manually prepending the length to the schema as arrow uses the legacy IPC format
// TODO: change after addressing ARROW-9777
let schema_len = serialized_schema.len();
let schema_len = serialized_schema.ipc_message.len();
let mut len_prefix_schema = Vec::with_capacity(schema_len + 8);
len_prefix_schema.append(&mut vec![255u8, 255, 255, 255]);
len_prefix_schema.append((schema_len as u32).to_le_bytes().to_vec().as_mut());
len_prefix_schema.append(&mut serialized_schema);
len_prefix_schema.append(&mut serialized_schema.ipc_message);

base64::encode(&len_prefix_schema)
}
Expand Down