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Remove parquet arrow_cast dependency #9077

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Merged
alamb merged 10 commits into from
Jan 9, 2026
Merged

Remove parquet arrow_cast dependency #9077

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ef215f2
Cleanup parquet casting
tustvold Dec 31, 2025
75cca82
Cleanup dictionary writing
tustvold Dec 31, 2025
abd9c4b
Avoid unnecessary Date64 cast
tustvold Dec 31, 2025
40acd4c
Make casting explicit in PrimitiveArrayReader
tustvold Dec 31, 2025
968e7f7
Rework writer
tustvold Dec 31, 2025
ed43f81
Add dictionary packing
tustvold Dec 31, 2025
f2831a3
Remove broken test
tustvold Dec 31, 2025
b0bd4a4
Clippy
tustvold Dec 31, 2025
b2216d4
Merge branch 'main' into cleanup-casting
alamb Jan 7, 2026
1bfb373
Merge branch 'main' into cleanup-casting
alamb Jan 9, 2026
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148 changes: 49 additions & 99 deletions parquet/src/arrow/array_reader/primitive_array.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,8 @@ use arrow_array::{
TimestampMicrosecondBufferBuilder, TimestampMillisecondBufferBuilder,
TimestampNanosecondBufferBuilder, TimestampSecondBufferBuilder,
},
cast::AsArray,
types::*,
};
use arrow_buffer::{BooleanBuffer, Buffer, i256};
use arrow_data::ArrayDataBuilder;
Expand Down Expand Up @@ -274,53 +276,36 @@ where
// See https://github.com/apache/arrow-rs/issues/7040 for a discussion of this
// issue.
ArrowType::UInt8 if *(array.data_type()) == ArrowType::Int32 => {
let array = array
.as_any()
.downcast_ref::<Int32Array>()
.unwrap()
.unary(|i| i as u8) as UInt8Array;
let array = array.as_primitive::<Int32Type>().unary(|i| i as u8) as UInt8Array;
Arc::new(array) as ArrayRef
}
ArrowType::Int8 if *(array.data_type()) == ArrowType::Int32 => {
let array = array
.as_any()
.downcast_ref::<Int32Array>()
.unwrap()
.unary(|i| i as i8) as Int8Array;
let array = array.as_primitive::<Int32Type>().unary(|i| i as i8) as Int8Array;
Arc::new(array) as ArrayRef
}
ArrowType::UInt16 if *(array.data_type()) == ArrowType::Int32 => {
let array = array
.as_any()
.downcast_ref::<Int32Array>()
.unwrap()
.unary(|i| i as u16) as UInt16Array;
let array = array.as_primitive::<Int32Type>().unary(|i| i as u16) as UInt16Array;
Arc::new(array) as ArrayRef
}
ArrowType::Int16 if *(array.data_type()) == ArrowType::Int32 => {
let array = array
.as_any()
.downcast_ref::<Int32Array>()
.unwrap()
.unary(|i| i as i16) as Int16Array;
let array = array.as_primitive::<Int32Type>().unary(|i| i as i16) as Int16Array;
Arc::new(array) as ArrayRef
}
ArrowType::Date64 if *(array.data_type()) == ArrowType::Int32 => {
// this is cheap as it internally reinterprets the data
let a = arrow_cast::cast(&array, &ArrowType::Date32)?;
let a = array
.as_primitive::<Int32Type>()
.reinterpret_cast::<Date32Type>();
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Contributor Author

@tustvold tustvold Dec 31, 2025

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When not performing a widening / truncating conversion, reinterpret_cast will be faster

arrow_cast::cast(&a, target_type)?
}
ArrowType::Decimal64(p, s) if *(array.data_type()) == ArrowType::Int32 => {
// Apply conversion to all elements regardless of null slots as the conversion
// to `i64` is infallible. This improves performance by avoiding a branch in
// the inner loop (see docs for `PrimitiveArray::unary`).
let array = match array.data_type() {
ArrowType::Int32 => array
.as_any()
.downcast_ref::<Int32Array>()
.unwrap()
.unary(|i| i as i64)
as Decimal64Array,
ArrowType::Int32 => {
array.as_primitive::<Int32Type>().unary(|i| i as i64) as Decimal64Array
}
_ => {
return Err(arrow_err!(
"Cannot convert {:?} to decimal",
Expand All @@ -334,43 +319,32 @@ where
}
ArrowType::Decimal128(p, s) => {
// See above comment. Conversion to `i128` is likewise infallible.
let array = match array.data_type() {
ArrowType::Int32 => array
.as_any()
.downcast_ref::<Int32Array>()
.unwrap()
.unary(|i| i as i128)
as Decimal128Array,
ArrowType::Int64 => array
.as_any()
.downcast_ref::<Int64Array>()
.unwrap()
.unary(|i| i as i128)
as Decimal128Array,
_ => {
return Err(arrow_err!(
"Cannot convert {:?} to decimal",
array.data_type()
));
let array =
match array.data_type() {
ArrowType::Int32 => array.as_primitive::<Int32Type>().unary(|i| i as i128)
as Decimal128Array,
ArrowType::Int64 => array.as_primitive::<Int64Type>().unary(|i| i as i128)
as Decimal128Array,
_ => {
return Err(arrow_err!(
"Cannot convert {:?} to decimal",
array.data_type()
));
}
}
}
.with_precision_and_scale(*p, *s)?;
.with_precision_and_scale(*p, *s)?;

Arc::new(array) as ArrayRef
}
ArrowType::Decimal256(p, s) => {
// See above comment. Conversion to `i256` is likewise infallible.
let array = match array.data_type() {
ArrowType::Int32 => array
.as_any()
.downcast_ref::<Int32Array>()
.unwrap()
.as_primitive::<Int32Type>()
.unary(|i| i256::from_i128(i as i128))
as Decimal256Array,
ArrowType::Int64 => array
.as_any()
.downcast_ref::<Int64Array>()
.unwrap()
.as_primitive::<Int64Type>()
.unary(|i| i256::from_i128(i as i128))
as Decimal256Array,
_ => {
Expand All @@ -388,11 +362,8 @@ where
ArrowType::Decimal32(p, s) => {
let array = match array.data_type() {
ArrowType::Int32 => array
.as_any()
.downcast_ref::<Int32Array>()
.unwrap()
.unary(|i| i)
as Decimal32Array,
.as_primitive::<Int32Type>()
.reinterpret_cast::<Decimal32Type>(),
_ => {
return Err(arrow_err!(
"Cannot convert {:?} to decimal dictionary",
Expand All @@ -406,18 +377,12 @@ where
}
ArrowType::Decimal64(p, s) => {
let array = match array.data_type() {
ArrowType::Int32 => array
.as_any()
.downcast_ref::<Int32Array>()
.unwrap()
.unary(|i| i as i64)
as Decimal64Array,
ArrowType::Int32 => {
array.as_primitive::<Int32Type>().unary(|i| i as i64) as Decimal64Array
}
ArrowType::Int64 => array
.as_any()
.downcast_ref::<Int64Array>()
.unwrap()
.unary(|i| i)
as Decimal64Array,
.as_primitive::<Int64Type>()
.reinterpret_cast::<Decimal64Type>(),
_ => {
return Err(arrow_err!(
"Cannot convert {:?} to decimal dictionary",
Expand All @@ -431,17 +396,9 @@ where
}
ArrowType::Decimal128(p, s) => {
let array = match array.data_type() {
ArrowType::Int32 => array
.as_any()
.downcast_ref::<Int32Array>()
.unwrap()
.unary(|i| i as i128)
ArrowType::Int32 => array.as_primitive::<Int32Type>().unary(|i| i as i128)
as Decimal128Array,
ArrowType::Int64 => array
.as_any()
.downcast_ref::<Int64Array>()
.unwrap()
.unary(|i| i as i128)
ArrowType::Int64 => array.as_primitive::<Int64Type>().unary(|i| i as i128)
as Decimal128Array,
_ => {
return Err(arrow_err!(
Expand All @@ -455,27 +412,20 @@ where
arrow_cast::cast(&array, target_type)?
}
ArrowType::Decimal256(p, s) => {
let array = match array.data_type() {
ArrowType::Int32 => array
.as_any()
.downcast_ref::<Int32Array>()
.unwrap()
.unary(i256::from)
as Decimal256Array,
ArrowType::Int64 => array
.as_any()
.downcast_ref::<Int64Array>()
.unwrap()
.unary(i256::from)
as Decimal256Array,
_ => {
return Err(arrow_err!(
"Cannot convert {:?} to decimal dictionary",
array.data_type()
));
let array =
match array.data_type() {
ArrowType::Int32 => array.as_primitive::<Int32Type>().unary(i256::from)
as Decimal256Array,
ArrowType::Int64 => array.as_primitive::<Int64Type>().unary(i256::from)
as Decimal256Array,
_ => {
return Err(arrow_err!(
"Cannot convert {:?} to decimal dictionary",
array.data_type()
));
}
}
}
.with_precision_and_scale(*p, *s)?;
.with_precision_and_scale(*p, *s)?;

arrow_cast::cast(&array, target_type)?
}
Expand Down
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