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Implement native support StringView for overlay #11968

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merged 4 commits into from
Aug 15, 2024
Merged

Implement native support StringView for overlay #11968

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d81501a
Implement native support StringView for overlay
PsiACE Aug 12, 2024
b7dbe5e
Re-write impl of overlay
PsiACE Aug 13, 2024
f32c444
Minor update
PsiACE Aug 13, 2024
907e27e
Add more tests
PsiACE Aug 14, 2024
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182 changes: 118 additions & 64 deletions datafusion/functions/src/string/overlay.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,9 @@ use std::sync::Arc;
use arrow::array::{ArrayRef, GenericStringArray, OffsetSizeTrait};
use arrow::datatypes::DataType;

use datafusion_common::cast::{as_generic_string_array, as_int64_array};
use datafusion_common::cast::{
as_generic_string_array, as_int64_array, as_string_view_array,
};
use datafusion_common::{exec_err, Result};
use datafusion_expr::TypeSignature::*;
use datafusion_expr::{ColumnarValue, Volatility};
Expand All @@ -46,8 +48,10 @@ impl OverlayFunc {
Self {
signature: Signature::one_of(
vec![
Exact(vec![Utf8View, Utf8View, Int64, Int64]),
Exact(vec![Utf8, Utf8, Int64, Int64]),
Exact(vec![LargeUtf8, LargeUtf8, Int64, Int64]),
Exact(vec![Utf8View, Utf8View, Int64]),
Exact(vec![Utf8, Utf8, Int64]),
Exact(vec![LargeUtf8, LargeUtf8, Int64]),
],
Expand Down Expand Up @@ -76,54 +80,107 @@ impl ScalarUDFImpl for OverlayFunc {

fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> {
match args[0].data_type() {
DataType::Utf8 => make_scalar_function(overlay::<i32>, vec![])(args),
DataType::Utf8View | DataType::Utf8 => {
make_scalar_function(overlay::<i32>, vec![])(args)
}
DataType::LargeUtf8 => make_scalar_function(overlay::<i64>, vec![])(args),
other => exec_err!("Unsupported data type {other:?} for function overlay"),
}
}
}

macro_rules! process_overlay {
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It would be nice to have some sort of trait in arrow-rs that allowed us to write this as a generic function

It actually does have
https://github.com/apache/arrow-rs/blob/2461a16c19ee5032531b1c05dd7e7192bc842e0f/arrow-string/src/like.rs#L158-L161

But that is not public

@XiangpengHao do you know of anything that is pub?

We could also implement such a trait for DataFusion's convenience, and then propose upstreaming it 🤔

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I was just behind -- it seems that @Omega359 did exactly this in StringArrayType #11941

datafusion/datafusion/functions/src/unicode/lpad.rs

Lines 251 to 263 in 94034be

trait StringArrayType<'a>: ArrayAccessor<Item = &'a str> + Sized {
fn iter(&self) -> ArrayIter<Self>;
}
impl<'a, T: OffsetSizeTrait> StringArrayType<'a> for &'a GenericStringArray<T> {
fn iter(&self) -> ArrayIter<Self> {
GenericStringArray::<T>::iter(self)
}
}
impl<'a> StringArrayType<'a> for &'a StringViewArray {
fn iter(&self) -> ArrayIter<Self> {
StringViewArray::iter(self)
}
}

Maybe we can start to pull that trait into its own module and start reusing it across the string functions 🤔

Also, there is the ArrayAccessor pattern used elegantly by @devanbenz in #11967 🤔

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The current style is inspired by rpad in #11942 . I'll be rewriting it with ArrayAccessor, which I've used in other PRs, and it's a much more elegant way.

// For the three-argument case
($string_array:expr, $characters_array:expr, $pos_num:expr) => {{
$string_array
.iter()
.zip($characters_array.iter())
.zip($pos_num.iter())
.map(|((string, characters), start_pos)| {
match (string, characters, start_pos) {
(Some(string), Some(characters), Some(start_pos)) => {
let string_len = string.chars().count();
let characters_len = characters.chars().count();
let replace_len = characters_len as i64;
let mut res =
String::with_capacity(string_len.max(characters_len));

//as sql replace index start from 1 while string index start from 0
if start_pos > 1 && start_pos - 1 < string_len as i64 {
let start = (start_pos - 1) as usize;
res.push_str(&string[..start]);
}
res.push_str(characters);
// if start + replace_len - 1 >= string_length, just to string end
if start_pos + replace_len - 1 < string_len as i64 {
let end = (start_pos + replace_len - 1) as usize;
res.push_str(&string[end..]);
}
Ok(Some(res))
}
_ => Ok(None),
}
})
.collect::<Result<GenericStringArray<T>>>()
}};

// For the four-argument case
($string_array:expr, $characters_array:expr, $pos_num:expr, $len_num:expr) => {{
$string_array
.iter()
.zip($characters_array.iter())
.zip($pos_num.iter())
.zip($len_num.iter())
.map(|(((string, characters), start_pos), len)| {
match (string, characters, start_pos, len) {
(Some(string), Some(characters), Some(start_pos), Some(len)) => {
let string_len = string.chars().count();
let characters_len = characters.chars().count();
let replace_len = len.min(string_len as i64);
let mut res =
String::with_capacity(string_len.max(characters_len));

//as sql replace index start from 1 while string index start from 0
if start_pos > 1 && start_pos - 1 < string_len as i64 {
let start = (start_pos - 1) as usize;
res.push_str(&string[..start]);
}
res.push_str(characters);
// if start + replace_len - 1 >= string_length, just to string end
if start_pos + replace_len - 1 < string_len as i64 {
let end = (start_pos + replace_len - 1) as usize;
res.push_str(&string[end..]);
}
Ok(Some(res))
}
_ => Ok(None),
}
})
.collect::<Result<GenericStringArray<T>>>()
}};
}

/// OVERLAY(string1 PLACING string2 FROM integer FOR integer2)
/// Replaces a substring of string1 with string2 starting at the integer bit
/// pgsql overlay('Txxxxas' placing 'hom' from 2 for 4) → Thomas
/// overlay('Txxxxas' placing 'hom' from 2) -> Thomxas, without for option, str2's len is instead
pub fn overlay<T: OffsetSizeTrait>(args: &[ArrayRef]) -> Result<ArrayRef> {
fn overlay<T: OffsetSizeTrait>(args: &[ArrayRef]) -> Result<ArrayRef> {
let use_string_view = args[0].data_type() == &DataType::Utf8View;
if use_string_view {
string_view_overlay::<T>(args)
} else {
string_overlay::<T>(args)
}
}

pub fn string_overlay<T: OffsetSizeTrait>(args: &[ArrayRef]) -> Result<ArrayRef> {
match args.len() {
3 => {
let string_array = as_generic_string_array::<T>(&args[0])?;
let characters_array = as_generic_string_array::<T>(&args[1])?;
let pos_num = as_int64_array(&args[2])?;

let result = string_array
.iter()
.zip(characters_array.iter())
.zip(pos_num.iter())
.map(|((string, characters), start_pos)| {
match (string, characters, start_pos) {
(Some(string), Some(characters), Some(start_pos)) => {
let string_len = string.chars().count();
let characters_len = characters.chars().count();
let replace_len = characters_len as i64;
let mut res =
String::with_capacity(string_len.max(characters_len));

//as sql replace index start from 1 while string index start from 0
if start_pos > 1 && start_pos - 1 < string_len as i64 {
let start = (start_pos - 1) as usize;
res.push_str(&string[..start]);
}
res.push_str(characters);
// if start + replace_len - 1 >= string_length, just to string end
if start_pos + replace_len - 1 < string_len as i64 {
let end = (start_pos + replace_len - 1) as usize;
res.push_str(&string[end..]);
}
Ok(Some(res))
}
_ => Ok(None),
}
})
.collect::<Result<GenericStringArray<T>>>()?;
let result = process_overlay!(string_array, characters_array, pos_num)?;
Ok(Arc::new(result) as ArrayRef)
}
4 => {
Expand All @@ -132,37 +189,34 @@ pub fn overlay<T: OffsetSizeTrait>(args: &[ArrayRef]) -> Result<ArrayRef> {
let pos_num = as_int64_array(&args[2])?;
let len_num = as_int64_array(&args[3])?;

let result = string_array
.iter()
.zip(characters_array.iter())
.zip(pos_num.iter())
.zip(len_num.iter())
.map(|(((string, characters), start_pos), len)| {
match (string, characters, start_pos, len) {
(Some(string), Some(characters), Some(start_pos), Some(len)) => {
let string_len = string.chars().count();
let characters_len = characters.chars().count();
let replace_len = len.min(string_len as i64);
let mut res =
String::with_capacity(string_len.max(characters_len));

//as sql replace index start from 1 while string index start from 0
if start_pos > 1 && start_pos - 1 < string_len as i64 {
let start = (start_pos - 1) as usize;
res.push_str(&string[..start]);
}
res.push_str(characters);
// if start + replace_len - 1 >= string_length, just to string end
if start_pos + replace_len - 1 < string_len as i64 {
let end = (start_pos + replace_len - 1) as usize;
res.push_str(&string[end..]);
}
Ok(Some(res))
}
_ => Ok(None),
}
})
.collect::<Result<GenericStringArray<T>>>()?;
let result =
process_overlay!(string_array, characters_array, pos_num, len_num)?;
Ok(Arc::new(result) as ArrayRef)
}
other => {
exec_err!("overlay was called with {other} arguments. It requires 3 or 4.")
}
}
}

pub fn string_view_overlay<T: OffsetSizeTrait>(args: &[ArrayRef]) -> Result<ArrayRef> {
match args.len() {
3 => {
let string_array = as_string_view_array(&args[0])?;
let characters_array = as_string_view_array(&args[1])?;
let pos_num = as_int64_array(&args[2])?;

let result = process_overlay!(string_array, characters_array, pos_num)?;
Ok(Arc::new(result) as ArrayRef)
}
4 => {
let string_array = as_string_view_array(&args[0])?;
let characters_array = as_string_view_array(&args[1])?;
let pos_num = as_int64_array(&args[2])?;
let len_num = as_int64_array(&args[3])?;

let result =
process_overlay!(string_array, characters_array, pos_num, len_num)?;
Ok(Arc::new(result) as ArrayRef)
}
other => {
Expand Down
2 changes: 1 addition & 1 deletion datafusion/sqllogictest/test_files/string_view.slt
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Original file line number Diff line number Diff line change
Expand Up @@ -726,7 +726,7 @@ EXPLAIN SELECT
FROM test;
----
logical_plan
01)Projection: overlay(CAST(test.column1_utf8view AS Utf8), Utf8("foo"), Int64(2)) AS c1
01)Projection: overlay(test.column1_utf8view, Utf8View("foo"), Int64(2)) AS c1
02)--TableScan: test projection=[column1_utf8view]

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Likewise, can we please also add actually running these queries to the tests

like

query 
SELECT OVERLAY(column1_utf8view PLACING 'foo' FROM 2 ) as c1

?

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Done! 907e27e

## Ensure no casts for REGEXP_LIKE
Expand Down