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/*!
* Helpers for parquet files
*/
use std::{
collections::{hash_map::Entry, HashMap},
sync::Arc,
};
use iceberg_rust_spec::spec::{
manifest::{AvroMap, Content, DataFile, FileFormat},
partition::PartitionField,
schema::Schema,
types::Type,
values::{Struct, Value},
};
use parquet::{
file::{metadata::RowGroupMetaData, writer::TrackedWrite},
format::FileMetaData,
schema::types::{from_thrift, SchemaDescriptor},
};
use thrift::protocol::{TCompactOutputProtocol, TSerializable};
use crate::error::Error;
/// Read datafile statistics from parquetfile
pub fn parquet_to_datafile(
location: &str,
file_size: usize,
file_metadata: &FileMetaData,
schema: &Schema,
partition_spec: &[PartitionField],
) -> Result<DataFile, Error> {
let mut partition = partition_spec
.iter()
.map(|x| Ok((x.name().clone(), None)))
.collect::<Result<Struct, Error>>()?;
let partition_fields = partition_spec
.iter()
.map(|x| {
let field = schema
.fields()
.get(*x.source_id() as usize)
.ok_or_else(|| Error::InvalidFormat("partition column in schema".to_string()))?;
Ok((field.name.clone(), x.clone()))
})
.collect::<Result<HashMap<String, PartitionField>, Error>>()?;
let parquet_schema = Arc::new(SchemaDescriptor::new(from_thrift(&file_metadata.schema)?));
let mut column_sizes = AvroMap(HashMap::new());
let mut value_counts = AvroMap(HashMap::new());
let mut null_value_counts = AvroMap(HashMap::new());
let mut distinct_counts = AvroMap(HashMap::new());
let mut lower_bounds: HashMap<i32, Value> = HashMap::new();
let mut upper_bounds: HashMap<i32, Value> = HashMap::new();
for row_group in &file_metadata.row_groups {
let row_group = RowGroupMetaData::from_thrift(parquet_schema.clone(), row_group.clone())?;
for column in row_group.columns() {
let column_name = column.column_descr().name();
let id = schema
.get_name(column_name)
.ok_or_else(|| Error::Schema(column_name.to_string(), "".to_string()))?
.id;
column_sizes
.entry(id)
.and_modify(|x| *x += column.compressed_size())
.or_insert(column.compressed_size());
value_counts
.entry(id)
.and_modify(|x| *x += row_group.num_rows())
.or_insert(row_group.num_rows());
if let Some(statistics) = column.statistics() {
null_value_counts
.entry(id)
.and_modify(|x| *x += statistics.null_count() as i64)
.or_insert(statistics.null_count() as i64);
if let Some(distinct_count) = statistics.distinct_count() {
distinct_counts
.entry(id)
.and_modify(|x| *x += distinct_count as i64)
.or_insert(distinct_count as i64);
}
let data_type = &schema
.fields()
.get(id as usize)
.ok_or_else(|| Error::Schema(column_name.to_string(), "".to_string()))?
.field_type;
if statistics.has_min_max_set() {
if let Type::Primitive(_) = &data_type {
let new = Value::try_from_bytes(statistics.min_bytes(), data_type)?;
match lower_bounds.entry(id) {
Entry::Occupied(mut entry) => {
let entry = entry.get_mut();
match (&entry, &new) {
(Value::Int(current), Value::Int(new_val)) => {
if *current > *new_val {
*entry = new
}
}
(Value::LongInt(current), Value::LongInt(new_val)) => {
if *current > *new_val {
*entry = new
}
}
(Value::Float(current), Value::Float(new_val)) => {
if *current > *new_val {
*entry = new
}
}
(Value::Double(current), Value::Double(new_val)) => {
if *current > *new_val {
*entry = new
}
}
(Value::Date(current), Value::Date(new_val)) => {
if *current > *new_val {
*entry = new
}
}
(Value::Time(current), Value::Time(new_val)) => {
if *current > *new_val {
*entry = new
}
}
(Value::Timestamp(current), Value::Timestamp(new_val)) => {
if *current > *new_val {
*entry = new
}
}
(Value::TimestampTZ(current), Value::TimestampTZ(new_val)) => {
if *current > *new_val {
*entry = new
}
}
_ => (),
}
}
Entry::Vacant(entry) => {
entry.insert(new);
}
}
let new = Value::try_from_bytes(statistics.max_bytes(), data_type)?;
match upper_bounds.entry(id) {
Entry::Occupied(mut entry) => {
let entry = entry.get_mut();
match (&entry, &new) {
(Value::Int(current), Value::Int(new_val)) => {
if *current < *new_val {
*entry = new
}
}
(Value::LongInt(current), Value::LongInt(new_val)) => {
if *current < *new_val {
*entry = new
}
}
(Value::Float(current), Value::Float(new_val)) => {
if *current < *new_val {
*entry = new
}
}
(Value::Double(current), Value::Double(new_val)) => {
if *current < *new_val {
*entry = new
}
}
(Value::Date(current), Value::Date(new_val)) => {
if *current < *new_val {
*entry = new
}
}
(Value::Time(current), Value::Time(new_val)) => {
if *current < *new_val {
*entry = new
}
}
(Value::Timestamp(current), Value::Timestamp(new_val)) => {
if *current < *new_val {
*entry = new
}
}
(Value::TimestampTZ(current), Value::TimestampTZ(new_val)) => {
if *current < *new_val {
*entry = new
}
}
_ => (),
}
}
Entry::Vacant(entry) => {
entry.insert(new);
}
}
if let Some(partition_field) = partition_fields.get(column_name) {
if let Some(partition_value) = partition.get_mut(partition_field.name())
{
if partition_value.is_none() {
let partition_field =
partition_fields.get(column_name).ok_or_else(|| {
Error::InvalidFormat("transform".to_string())
})?;
let min =
Value::try_from_bytes(statistics.min_bytes(), data_type)?
.tranform(partition_field.transform())?;
let max =
Value::try_from_bytes(statistics.max_bytes(), data_type)?
.tranform(partition_field.transform())?;
if min == max {
*partition_value = Some(min)
}
}
}
}
}
}
}
}
}
let content = DataFile::builder()
.with_content(Content::Data)
.with_file_path(location.to_string())
.with_file_format(FileFormat::Parquet)
.with_partition(partition)
.with_record_count(file_metadata.num_rows)
.with_file_size_in_bytes(file_size as i64)
.with_column_sizes(Some(column_sizes))
.with_value_counts(Some(value_counts))
.with_null_value_counts(Some(null_value_counts))
.with_nan_value_counts(None)
.with_distinct_counts(Some(distinct_counts))
.with_lower_bounds(Some(lower_bounds))
.with_upper_bounds(Some(upper_bounds))
.build()
.map_err(iceberg_rust_spec::error::Error::from)?;
Ok(content)
}
/// Get parquet metadata size
pub fn thrift_size<T: TSerializable>(metadata: &T) -> Result<usize, Error> {
let mut buffer = TrackedWrite::new(Vec::<u8>::new());
let mut protocol = TCompactOutputProtocol::new(&mut buffer);
metadata.write_to_out_protocol(&mut protocol)?;
Ok(buffer.bytes_written())
}