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use ahash::AHashMap;
use regex::bytes::Regex as BytesRegex;
use regex::Regex;
use crate::{
array::{BinaryArray, BooleanArray, Offset, Utf8Array},
bitmap::Bitmap,
compute::utils::combine_validities,
datatypes::DataType,
error::{Error, Result},
};
#[inline]
fn is_like_pattern(c: char) -> bool {
c == '%' || c == '_'
}
fn replace_pattern(pattern: &str) -> String {
let mut result = String::new();
let text = String::from(pattern);
let mut chars_iter = text.chars().peekable();
while let Some(c) = chars_iter.next() {
if c == '\\' {
let next = chars_iter.peek();
match next {
Some(next) if is_like_pattern(*next) => {
result.push(*next);
chars_iter.next();
}
_ => {
result.push('\\');
result.push('\\');
}
}
} else if regex_syntax::is_meta_character(c) {
result.push('\\');
result.push(c);
} else if c == '%' {
result.push_str(".*");
} else if c == '_' {
result.push('.');
} else {
result.push(c);
}
}
result
}
#[inline]
fn a_like_utf8<O: Offset, F: Fn(bool) -> bool>(
lhs: &Utf8Array<O>,
rhs: &Utf8Array<O>,
op: F,
) -> Result<BooleanArray> {
if lhs.len() != rhs.len() {
return Err(Error::InvalidArgumentError(
"Cannot perform comparison operation on arrays of different length".to_string(),
));
}
let validity = combine_validities(lhs.validity(), rhs.validity());
let mut map = AHashMap::new();
let values =
Bitmap::try_from_trusted_len_iter(lhs.iter().zip(rhs.iter()).map(|(lhs, rhs)| {
match (lhs, rhs) {
(Some(lhs), Some(pattern)) => {
let pattern = if let Some(pattern) = map.get(pattern) {
pattern
} else {
let re_pattern = replace_pattern(pattern);
let re = Regex::new(&format!("^{}$", re_pattern)).map_err(|e| {
Error::InvalidArgumentError(format!(
"Unable to build regex from LIKE pattern: {}",
e
))
})?;
map.insert(pattern, re);
map.get(pattern).unwrap()
};
Result::Ok(op(pattern.is_match(lhs)))
}
_ => Ok(false),
}
}))?;
Ok(BooleanArray::new(DataType::Boolean, values, validity))
}
pub fn like_utf8<O: Offset>(lhs: &Utf8Array<O>, rhs: &Utf8Array<O>) -> Result<BooleanArray> {
a_like_utf8(lhs, rhs, |x| x)
}
pub fn nlike_utf8<O: Offset>(lhs: &Utf8Array<O>, rhs: &Utf8Array<O>) -> Result<BooleanArray> {
a_like_utf8(lhs, rhs, |x| !x)
}
fn a_like_utf8_scalar<O: Offset, F: Fn(bool) -> bool>(
lhs: &Utf8Array<O>,
rhs: &str,
op: F,
) -> Result<BooleanArray> {
let validity = lhs.validity();
let values = if !rhs.contains(is_like_pattern) {
Bitmap::from_trusted_len_iter(lhs.values_iter().map(|x| op(x == rhs)))
} else if rhs.ends_with('%')
&& !rhs.ends_with("\\%")
&& !rhs[..rhs.len() - 1].contains(is_like_pattern)
{
let starts_with = &rhs[..rhs.len() - 1];
Bitmap::from_trusted_len_iter(lhs.values_iter().map(|x| op(x.starts_with(starts_with))))
} else if rhs.starts_with('%') && !rhs[1..].contains(is_like_pattern) {
let ends_with = &rhs[1..];
Bitmap::from_trusted_len_iter(lhs.values_iter().map(|x| op(x.ends_with(ends_with))))
} else {
let re_pattern = replace_pattern(rhs);
let re = Regex::new(&format!("^{}$", re_pattern)).map_err(|e| {
Error::InvalidArgumentError(format!("Unable to build regex from LIKE pattern: {}", e))
})?;
Bitmap::from_trusted_len_iter(lhs.values_iter().map(|x| op(re.is_match(x))))
};
Ok(BooleanArray::new(
DataType::Boolean,
values,
validity.cloned(),
))
}
pub fn like_utf8_scalar<O: Offset>(lhs: &Utf8Array<O>, rhs: &str) -> Result<BooleanArray> {
a_like_utf8_scalar(lhs, rhs, |x| x)
}
pub fn nlike_utf8_scalar<O: Offset>(lhs: &Utf8Array<O>, rhs: &str) -> Result<BooleanArray> {
a_like_utf8_scalar(lhs, rhs, |x| !x)
}
#[inline]
fn a_like_binary<O: Offset, F: Fn(bool) -> bool>(
lhs: &BinaryArray<O>,
rhs: &BinaryArray<O>,
op: F,
) -> Result<BooleanArray> {
if lhs.len() != rhs.len() {
return Err(Error::InvalidArgumentError(
"Cannot perform comparison operation on arrays of different length".to_string(),
));
}
let validity = combine_validities(lhs.validity(), rhs.validity());
let mut map = AHashMap::new();
let values =
Bitmap::try_from_trusted_len_iter(lhs.iter().zip(rhs.iter()).map(|(lhs, rhs)| {
match (lhs, rhs) {
(Some(lhs), Some(pattern)) => {
let pattern = if let Some(pattern) = map.get(pattern) {
pattern
} else {
let re_pattern = simdutf8::basic::from_utf8(pattern).unwrap();
let re_pattern = replace_pattern(re_pattern);
let re = BytesRegex::new(&format!("^{}$", re_pattern)).map_err(|e| {
Error::InvalidArgumentError(format!(
"Unable to build regex from LIKE pattern: {}",
e
))
})?;
map.insert(pattern, re);
map.get(pattern).unwrap()
};
Result::Ok(op(pattern.is_match(lhs)))
}
_ => Ok(false),
}
}))?;
Ok(BooleanArray::new(DataType::Boolean, values, validity))
}
pub fn like_binary<O: Offset>(lhs: &BinaryArray<O>, rhs: &BinaryArray<O>) -> Result<BooleanArray> {
a_like_binary(lhs, rhs, |x| x)
}
pub fn nlike_binary<O: Offset>(lhs: &BinaryArray<O>, rhs: &BinaryArray<O>) -> Result<BooleanArray> {
a_like_binary(lhs, rhs, |x| !x)
}
fn a_like_binary_scalar<O: Offset, F: Fn(bool) -> bool>(
lhs: &BinaryArray<O>,
rhs: &[u8],
op: F,
) -> Result<BooleanArray> {
let validity = lhs.validity();
let pattern = simdutf8::basic::from_utf8(rhs).map_err(|e| {
Error::InvalidArgumentError(format!(
"Unable to convert the LIKE pattern to string: {}",
e
))
})?;
let values = if !pattern.contains(is_like_pattern) {
Bitmap::from_trusted_len_iter(lhs.values_iter().map(|x| op(x == rhs)))
} else if pattern.ends_with('%')
&& !pattern.ends_with("\\%")
&& !pattern[..pattern.len() - 1].contains(is_like_pattern)
{
let starts_with = &rhs[..rhs.len() - 1];
Bitmap::from_trusted_len_iter(lhs.values_iter().map(|x| op(x.starts_with(starts_with))))
} else if pattern.starts_with('%') && !pattern[1..].contains(is_like_pattern) {
let ends_with = &rhs[1..];
Bitmap::from_trusted_len_iter(lhs.values_iter().map(|x| op(x.ends_with(ends_with))))
} else {
let re_pattern = replace_pattern(pattern);
let re = BytesRegex::new(&format!("^{}$", re_pattern)).map_err(|e| {
Error::InvalidArgumentError(format!("Unable to build regex from LIKE pattern: {}", e))
})?;
Bitmap::from_trusted_len_iter(lhs.values_iter().map(|x| op(re.is_match(x))))
};
Ok(BooleanArray::new(
DataType::Boolean,
values,
validity.cloned(),
))
}
pub fn like_binary_scalar<O: Offset>(lhs: &BinaryArray<O>, rhs: &[u8]) -> Result<BooleanArray> {
a_like_binary_scalar(lhs, rhs, |x| x)
}
pub fn nlike_binary_scalar<O: Offset>(lhs: &BinaryArray<O>, rhs: &[u8]) -> Result<BooleanArray> {
a_like_binary_scalar(lhs, rhs, |x| !x)
}