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[Parquet] perf: preallocate capacity for ArrayReaderBuilder #9093

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[Parquet] perf: preallocate capacity for ArrayReaderBuilder #9093

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a6a4642
Minor: pre allocate view vec
lyang24 Jan 3, 2026
530c8ec
Pass down batch_size from ArrowReaderBuilder through ArrayReaderBuild…
lyang24 Jan 10, 2026
dd4884c
made the value buffer optional and made the initialization on read to…
lyang24 Jan 22, 2026
3d7ba2d
Optimize dict decode and view writes
lyang24 Mar 21, 2026
be6ed55
Merge branch 'main' into pre_allocate_view_vec
alamb Apr 16, 2026
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92 changes: 71 additions & 21 deletions parquet/benches/arrow_reader.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ use parquet::arrow::array_reader::{
ListArrayReader, make_byte_array_reader, make_byte_view_array_reader,
make_fixed_len_byte_array_reader,
};
use parquet::arrow::arrow_reader::DEFAULT_BATCH_SIZE;
use parquet::basic::Type;
use parquet::data_type::{ByteArray, FixedLenByteArrayType};
use parquet::util::{DataPageBuilder, DataPageBuilderImpl, InMemoryPageIterator};
Expand Down Expand Up @@ -709,15 +710,23 @@ fn create_primitive_array_reader(
use parquet::arrow::array_reader::PrimitiveArrayReader;
match column_desc.physical_type() {
Type::INT32 => {
let reader =
PrimitiveArrayReader::<Int32Type>::new(Box::new(page_iterator), column_desc, None)
.unwrap();
let reader = PrimitiveArrayReader::<Int32Type>::new(
Box::new(page_iterator),
column_desc,
None,
DEFAULT_BATCH_SIZE,
)
.unwrap();
Box::new(reader)
}
Type::INT64 => {
let reader =
PrimitiveArrayReader::<Int64Type>::new(Box::new(page_iterator), column_desc, None)
.unwrap();
let reader = PrimitiveArrayReader::<Int64Type>::new(
Box::new(page_iterator),
column_desc,
None,
DEFAULT_BATCH_SIZE,
)
.unwrap();
Box::new(reader)
}
_ => unreachable!(),
Expand All @@ -730,9 +739,13 @@ fn create_f16_by_bytes_reader(
) -> Box<dyn ArrayReader> {
let physical_type = column_desc.physical_type();
match physical_type {
Type::FIXED_LEN_BYTE_ARRAY => {
make_fixed_len_byte_array_reader(Box::new(page_iterator), column_desc, None).unwrap()
}
Type::FIXED_LEN_BYTE_ARRAY => make_fixed_len_byte_array_reader(
Box::new(page_iterator),
column_desc,
None,
DEFAULT_BATCH_SIZE,
)
.unwrap(),
_ => unimplemented!(),
}
}
Expand All @@ -743,12 +756,20 @@ fn create_decimal_by_bytes_reader(
) -> Box<dyn ArrayReader> {
let physical_type = column_desc.physical_type();
match physical_type {
Type::BYTE_ARRAY => {
make_byte_array_reader(Box::new(page_iterator), column_desc, None).unwrap()
}
Type::FIXED_LEN_BYTE_ARRAY => {
make_fixed_len_byte_array_reader(Box::new(page_iterator), column_desc, None).unwrap()
}
Type::BYTE_ARRAY => make_byte_array_reader(
Box::new(page_iterator),
column_desc,
None,
DEFAULT_BATCH_SIZE,
)
.unwrap(),
Type::FIXED_LEN_BYTE_ARRAY => make_fixed_len_byte_array_reader(
Box::new(page_iterator),
column_desc,
None,
DEFAULT_BATCH_SIZE,
)
.unwrap(),
_ => unimplemented!(),
}
}
Expand All @@ -757,28 +778,52 @@ fn create_fixed_len_byte_array_reader(
page_iterator: impl PageIterator + 'static,
column_desc: ColumnDescPtr,
) -> Box<dyn ArrayReader> {
make_fixed_len_byte_array_reader(Box::new(page_iterator), column_desc, None).unwrap()
make_fixed_len_byte_array_reader(
Box::new(page_iterator),
column_desc,
None,
DEFAULT_BATCH_SIZE,
)
.unwrap()
}

fn create_byte_array_reader(
page_iterator: impl PageIterator + 'static,
column_desc: ColumnDescPtr,
) -> Box<dyn ArrayReader> {
make_byte_array_reader(Box::new(page_iterator), column_desc, None).unwrap()
make_byte_array_reader(
Box::new(page_iterator),
column_desc,
None,
DEFAULT_BATCH_SIZE,
)
.unwrap()
}

fn create_byte_view_array_reader(
page_iterator: impl PageIterator + 'static,
column_desc: ColumnDescPtr,
) -> Box<dyn ArrayReader> {
make_byte_view_array_reader(Box::new(page_iterator), column_desc, None).unwrap()
make_byte_view_array_reader(
Box::new(page_iterator),
column_desc,
None,
DEFAULT_BATCH_SIZE,
)
.unwrap()
}

fn create_string_view_byte_array_reader(
page_iterator: impl PageIterator + 'static,
column_desc: ColumnDescPtr,
) -> Box<dyn ArrayReader> {
make_byte_view_array_reader(Box::new(page_iterator), column_desc, None).unwrap()
make_byte_view_array_reader(
Box::new(page_iterator),
column_desc,
None,
DEFAULT_BATCH_SIZE,
)
.unwrap()
}

fn create_string_byte_array_dictionary_reader(
Expand All @@ -788,8 +833,13 @@ fn create_string_byte_array_dictionary_reader(
use parquet::arrow::array_reader::make_byte_array_dictionary_reader;
let arrow_type = DataType::Dictionary(Box::new(DataType::Int32), Box::new(DataType::Utf8));

make_byte_array_dictionary_reader(Box::new(page_iterator), column_desc, Some(arrow_type))
.unwrap()
make_byte_array_dictionary_reader(
Box::new(page_iterator),
column_desc,
Some(arrow_type),
DEFAULT_BATCH_SIZE,
)
.unwrap()
}

fn create_string_list_reader(
Expand Down
58 changes: 48 additions & 10 deletions parquet/src/arrow/array_reader/builder.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@ use crate::arrow::array_reader::{
NullArrayReader, PrimitiveArrayReader, RowGroups, StructArrayReader,
make_byte_array_dictionary_reader, make_byte_array_reader,
};
use crate::arrow::arrow_reader::DEFAULT_BATCH_SIZE;
use crate::arrow::arrow_reader::metrics::ArrowReaderMetrics;
use crate::arrow::schema::{ParquetField, ParquetFieldType, VirtualColumnType};
use crate::basic::Type as PhysicalType;
Expand Down Expand Up @@ -96,18 +97,30 @@ pub struct ArrayReaderBuilder<'a> {
parquet_metadata: Option<&'a ParquetMetaData>,
/// metrics
metrics: &'a ArrowReaderMetrics,
/// Batch size for pre-allocating internal buffers
batch_size: usize,
}

impl<'a> ArrayReaderBuilder<'a> {
/// Create a new `ArrayReaderBuilder`
pub fn new(row_groups: &'a dyn RowGroups, metrics: &'a ArrowReaderMetrics) -> Self {
Self {
row_groups,
cache_options: None,
parquet_metadata: None,
metrics,
batch_size: DEFAULT_BATCH_SIZE,
}
}

/// Set the batch size used to pre-allocate internal buffers.
///
/// This avoids reallocations when reading the first batch of data.
pub fn with_batch_size(mut self, batch_size: usize) -> Self {
self.batch_size = batch_size;
self
}

/// Add cache options to the builder
pub fn with_cache_options(mut self, cache_options: Option<&'a CacheOptions<'a>>) -> Self {
self.cache_options = cache_options;
Expand Down Expand Up @@ -414,55 +427,78 @@ impl<'a> ArrayReaderBuilder<'a> {
page_iterator,
column_desc,
arrow_type,
self.batch_size,
)?) as _,
PhysicalType::INT32 => {
if let Some(DataType::Null) = arrow_type {
Box::new(NullArrayReader::<Int32Type>::new(
page_iterator,
column_desc,
self.batch_size,
)?) as _
} else {
Box::new(PrimitiveArrayReader::<Int32Type>::new(
page_iterator,
column_desc,
arrow_type,
self.batch_size,
)?) as _
}
}
PhysicalType::INT64 => Box::new(PrimitiveArrayReader::<Int64Type>::new(
page_iterator,
column_desc,
arrow_type,
self.batch_size,
)?) as _,
PhysicalType::INT96 => Box::new(PrimitiveArrayReader::<Int96Type>::new(
page_iterator,
column_desc,
arrow_type,
self.batch_size,
)?) as _,
PhysicalType::FLOAT => Box::new(PrimitiveArrayReader::<FloatType>::new(
page_iterator,
column_desc,
arrow_type,
self.batch_size,
)?) as _,
PhysicalType::DOUBLE => Box::new(PrimitiveArrayReader::<DoubleType>::new(
page_iterator,
column_desc,
arrow_type,
self.batch_size,
)?) as _,
PhysicalType::BYTE_ARRAY => match arrow_type {
Some(DataType::Dictionary(_, _)) => {
make_byte_array_dictionary_reader(page_iterator, column_desc, arrow_type)?
Some(DataType::Dictionary(_, _)) => make_byte_array_dictionary_reader(
page_iterator,
column_desc,
arrow_type,
self.batch_size,
)?,
Some(DataType::Utf8View | DataType::BinaryView) => make_byte_view_array_reader(
page_iterator,
column_desc,
arrow_type,
self.batch_size,
)?,
_ => {
make_byte_array_reader(page_iterator, column_desc, arrow_type, self.batch_size)?
}
Some(DataType::Utf8View | DataType::BinaryView) => {
make_byte_view_array_reader(page_iterator, column_desc, arrow_type)?
}
_ => make_byte_array_reader(page_iterator, column_desc, arrow_type)?,
},
PhysicalType::FIXED_LEN_BYTE_ARRAY => match arrow_type {
Some(DataType::Dictionary(_, _)) => {
make_byte_array_dictionary_reader(page_iterator, column_desc, arrow_type)?
}
_ => make_fixed_len_byte_array_reader(page_iterator, column_desc, arrow_type)?,
Some(DataType::Dictionary(_, _)) => make_byte_array_dictionary_reader(
page_iterator,
column_desc,
arrow_type,
self.batch_size,
)?,
_ => make_fixed_len_byte_array_reader(
page_iterator,
column_desc,
arrow_type,
self.batch_size,
)?,
},
};
Ok(Some(reader))
Expand Down Expand Up @@ -533,6 +569,7 @@ mod tests {

let metrics = ArrowReaderMetrics::disabled();
let array_reader = ArrayReaderBuilder::new(&file_reader, &metrics)
.with_batch_size(DEFAULT_BATCH_SIZE)
.build_array_reader(fields.as_ref(), &mask)
.unwrap();

Expand Down Expand Up @@ -566,6 +603,7 @@ mod tests {

let metrics = ArrowReaderMetrics::disabled();
let array_reader = ArrayReaderBuilder::new(&file_reader, &metrics)
.with_batch_size(DEFAULT_BATCH_SIZE)
.with_parquet_metadata(file_reader.metadata())
.build_array_reader(fields.as_ref(), &mask)
.unwrap();
Expand Down
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