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Lazy array display (#3638) #3647

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merged 18 commits into from
Feb 8, 2023
Merged

Lazy array display (#3638) #3647

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17d990b
Lazy array display (#3638)
tustvold Feb 2, 2023
f24b986
Update CSV writer
tustvold Feb 3, 2023
0a047e9
Borrow
tustvold Feb 3, 2023
98dfcde
Time formatting
tustvold Feb 3, 2023
41c8ff0
Update pretty
tustvold Feb 3, 2023
630b6ac
Add FixedSizeBinaryArray
tustvold Feb 3, 2023
58d8872
Further tweaks
tustvold Feb 3, 2023
f9605dd
Clippy
tustvold Feb 3, 2023
404d37b
More clippy
tustvold Feb 3, 2023
9ce362b
More tweaks
tustvold Feb 3, 2023
fba93d5
More clippy
tustvold Feb 3, 2023
bee36af
Clippy
tustvold Feb 4, 2023
cede615
Use lexical_core
tustvold Feb 4, 2023
e4e8387
Update doctest
tustvold Feb 6, 2023
6d6a230
Review feedback
tustvold Feb 8, 2023
4562430
Merge remote-tracking branch 'upstream/master' into rework-display
tustvold Feb 8, 2023
8cf3c97
Bump CI
tustvold Feb 8, 2023
bd82da1
Review feedback
tustvold Feb 8, 2023
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1,378 changes: 718 additions & 660 deletions arrow-cast/src/display.rs
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213 changes: 52 additions & 161 deletions arrow-csv/src/writer.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -63,12 +63,10 @@
//! }
//! ```

use arrow_array::types::*;
use arrow_array::*;
use arrow_cast::display::{
array_value_to_string, lexical_to_string, temporal_array_value_to_string,
};
use arrow_cast::display::*;
use arrow_schema::*;
use csv::ByteRecord;
use std::io::Write;

use crate::map_csv_error;
Expand All @@ -79,15 +77,6 @@ const DEFAULT_TIMESTAMP_FORMAT: &str = "%FT%H:%M:%S.%9f";
const DEFAULT_TIMESTAMP_TZ_FORMAT: &str = "%FT%H:%M:%S.%9f%:z";
const DEFAULT_NULL_VALUE: &str = "";

fn write_primitive_value<T>(array: &ArrayRef, i: usize) -> String
where
T: ArrowPrimitiveType,
T::Native: lexical_core::ToLexical,
{
let c = array.as_any().downcast_ref::<PrimitiveArray<T>>().unwrap();
lexical_to_string(c.value(i))
}

/// A CSV writer
#[derive(Debug)]
pub struct Writer<W: Write> {
Expand All @@ -100,10 +89,8 @@ pub struct Writer<W: Write> {
/// The datetime format for datetime arrays
datetime_format: Option<String>,
/// The timestamp format for timestamp arrays
#[allow(dead_code)]
timestamp_format: Option<String>,
/// The timestamp format for timestamp (with timezone) arrays
#[allow(dead_code)]
timestamp_tz_format: Option<String>,
/// The time format for time arrays
time_format: Option<String>,
Expand Down Expand Up @@ -132,113 +119,6 @@ impl<W: Write> Writer<W> {
}
}

/// Convert a record to a string vector
fn convert(
&self,
batch: &[ArrayRef],
row_index: usize,
buffer: &mut [String],
) -> Result<(), ArrowError> {
// TODO: it'd be more efficient if we could create `record: Vec<&[u8]>
for (col_index, item) in buffer.iter_mut().enumerate() {
let col = &batch[col_index];
if col.is_null(row_index) {
// write the configured null value
*item = self.null_value.clone();
continue;
}
let string = match col.data_type() {
DataType::Float64 => write_primitive_value::<Float64Type>(col, row_index),
DataType::Float32 => write_primitive_value::<Float32Type>(col, row_index),
DataType::Int8 => write_primitive_value::<Int8Type>(col, row_index),
DataType::Int16 => write_primitive_value::<Int16Type>(col, row_index),
DataType::Int32 => write_primitive_value::<Int32Type>(col, row_index),
DataType::Int64 => write_primitive_value::<Int64Type>(col, row_index),
DataType::UInt8 => write_primitive_value::<UInt8Type>(col, row_index),
DataType::UInt16 => write_primitive_value::<UInt16Type>(col, row_index),
DataType::UInt32 => write_primitive_value::<UInt32Type>(col, row_index),
DataType::UInt64 => write_primitive_value::<UInt64Type>(col, row_index),
DataType::Boolean => array_value_to_string(col, row_index)?.to_string(),
DataType::Utf8 => array_value_to_string(col, row_index)?.to_string(),
DataType::LargeUtf8 => array_value_to_string(col, row_index)?.to_string(),
DataType::Date32 => temporal_array_value_to_string(
col,
col_index,
row_index,
self.date_format.as_deref(),
)?
.to_string(),
DataType::Date64 => temporal_array_value_to_string(
col,
col_index,
row_index,
self.datetime_format.as_deref(),
)?
.to_string(),
DataType::Time32(TimeUnit::Second) => temporal_array_value_to_string(
col,
col_index,
row_index,
self.time_format.as_deref(),
)?
.to_string(),
DataType::Time32(TimeUnit::Millisecond) => {
temporal_array_value_to_string(
col,
col_index,
row_index,
self.time_format.as_deref(),
)?
.to_string()
}
DataType::Time64(TimeUnit::Microsecond) => {
temporal_array_value_to_string(
col,
col_index,
row_index,
self.time_format.as_deref(),
)?
.to_string()
}
DataType::Time64(TimeUnit::Nanosecond) => temporal_array_value_to_string(
col,
col_index,
row_index,
self.time_format.as_deref(),
)?
.to_string(),
DataType::Timestamp(_, time_zone) => match time_zone {
Some(_tz) => temporal_array_value_to_string(
col,
col_index,
row_index,
self.timestamp_tz_format.as_deref(),
)?
.to_string(),
None => temporal_array_value_to_string(
col,
col_index,
row_index,
self.timestamp_format.as_deref(),
)?
.to_string(),
},
DataType::Decimal128(..) => {
array_value_to_string(col, row_index)?.to_string()
}
t => {
// List and Struct arrays not supported by the writer, any
// other type needs to be implemented
return Err(ArrowError::CsvError(format!(
"CSV Writer does not support {t:?} data type"
)));
}
};
*item = string;
}
Ok(())
}

/// Write a vector of record batches to a writable object
pub fn write(&mut self, batch: &RecordBatch) -> Result<(), ArrowError> {
let num_columns = batch.num_columns();
Expand All @@ -257,23 +137,49 @@ impl<W: Write> Writer<W> {
self.beginning = false;
}

let columns: Vec<_> = batch
let options = FormatOptions::default()
.with_null(&self.null_value)
.with_date_format(self.date_format.as_deref())
.with_datetime_format(self.datetime_format.as_deref())
.with_timestamp_format(self.timestamp_format.as_deref())
.with_timestamp_tz_format(self.timestamp_tz_format.as_deref())
.with_time_format(self.time_format.as_deref());

let converters = batch
.columns()
.iter()
.map(|array| match array.data_type() {
DataType::Dictionary(_, value_type) => {
arrow_cast::cast(array, value_type)
.expect("cannot cast dictionary to underlying values")
}
_ => array.clone(),
.map(|a| match a.data_type() {
d if d.is_nested() => Err(ArrowError::CsvError(format!(
"Nested type {} is not supported in CSV",
a.data_type()
))),
DataType::Binary | DataType::LargeBinary => Err(ArrowError::CsvError(
"Binary data cannot be written to CSV".to_string(),
)),
_ => ArrayFormatter::try_new(a.as_ref(), &options),
})
.collect();

let mut buffer = vec!["".to_string(); batch.num_columns()];
.collect::<Result<Vec<_>, ArrowError>>()?;

let mut buffer = String::with_capacity(1024);
let mut byte_record = ByteRecord::with_capacity(1024, converters.len());

for row_idx in 0..batch.num_rows() {
byte_record.clear();
for (col_idx, converter) in converters.iter().enumerate() {
buffer.clear();
converter.value(row_idx).write(&mut buffer).map_err(|e| {
ArrowError::CsvError(format!(
"Error formatting row {} and column {}: {e}",
row_idx + 1,
col_idx + 1
))
})?;
byte_record.push_field(buffer.as_bytes());
}

for row_index in 0..batch.num_rows() {
self.convert(columns.as_slice(), row_index, &mut buffer)?;
self.writer.write_record(&buffer).map_err(map_csv_error)?;
self.writer
.write_byte_record(&byte_record)
.map_err(map_csv_error)?;
}
self.writer.flush()?;

Expand Down Expand Up @@ -384,16 +290,13 @@ impl WriterBuilder {
self
}

/// Use RFC3339 format for date/time/timestamps by clearing all
/// date/time specific formats.
pub fn with_rfc3339(mut self, use_rfc3339: bool) -> Self {
if use_rfc3339 {
self.date_format = None;
self.datetime_format = None;
self.time_format = None;
self.timestamp_format = None;
self.timestamp_tz_format = None;
}
/// Use RFC3339 format for date/time/timestamps
pub fn with_rfc3339(mut self) -> Self {
self.date_format = None;
self.datetime_format = None;
self.time_format = None;
self.timestamp_format = None;
self.timestamp_tz_format = None;
self
}

Expand Down Expand Up @@ -423,15 +326,10 @@ mod tests {
use super::*;

use crate::Reader;
use arrow_array::types::*;
use std::io::{Cursor, Read, Seek};
use std::sync::Arc;

fn invalid_cast_error(dt: &str, col_idx: usize, row_idx: usize) -> ArrowError {
ArrowError::CastError(format!(
"Cannot cast to {dt} at col index: {col_idx} row index: {row_idx}"
))
}

#[test]
fn test_write_csv() {
let schema = Schema::new(vec![
Expand Down Expand Up @@ -654,15 +552,8 @@ sed do eiusmod tempor,-556132.25,1,,2019-04-18T02:45:55.555000000,23:46:03,foo
let batches = vec![&batch, &batch];

for batch in batches {
writer
.write(batch)
.map_err(|e| {
dbg!(e.to_string());
assert!(e.to_string().ends_with(
invalid_cast_error("Date64", 1, 1).to_string().as_str()
))
})
.unwrap_err();
let err = writer.write(batch).unwrap_err().to_string();
assert_eq!(err, "Csv error: Error formatting row 2 and column 2: Cast error: Failed to convert 1926632005177685347 to temporal for Date64")
}
drop(writer);
}
Expand Down Expand Up @@ -700,7 +591,7 @@ sed do eiusmod tempor,-556132.25,1,,2019-04-18T02:45:55.555000000,23:46:03,foo

let mut file = tempfile::tempfile().unwrap();

let builder = WriterBuilder::new().with_rfc3339(true);
let builder = WriterBuilder::new().with_rfc3339();
let mut writer = builder.build(&mut file);
let batches = vec![&batch];
for batch in batches {
Expand Down
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