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gcd.rs
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gcd.rs
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use fastdivide::DividerU64;
use gcd::Gcd;
pub const GCD_DEFAULT: u64 = 1;
pub fn find_gcd(mut numbers: impl Iterator<Item = u64>, base: u64) -> Option<u64> {
let mut num1 = 0;
let mut num2 = 0;
loop {
let num = numbers.next()? - base;
if num1 == 0 {
num1 = num;
}
if num2 == 0 {
num2 = num;
}
if num1 != 0 && num2 != 0 {
break;
}
}
let mut gcd = (num1).gcd(num2);
if gcd == 0 {
return None;
}
let mut gcd_divider = DividerU64::divide_by(gcd);
for val in numbers {
let val = val - base;
if val == 0 {
continue;
}
let rem = val - (gcd_divider.divide(val)) * gcd;
if rem == 0 {
continue;
}
gcd = gcd.gcd(val);
if gcd == 1 {
return None;
}
gcd_divider = DividerU64::divide_by(gcd);
}
Some(gcd)
}
#[cfg(test)]
mod tests {
use std::collections::HashMap;
use std::path::Path;
use common::HasLen;
use crate::directory::{CompositeFile, RamDirectory, WritePtr};
use crate::fastfield::serializer::{FastFieldCodecEnableCheck, FastFieldCodecName, ALL_CODECS};
use crate::fastfield::tests::{FIELD, FIELDI64, SCHEMA, SCHEMAI64};
use crate::fastfield::{
CompositeFastFieldSerializer, DynamicFastFieldReader, FastFieldReader, FastFieldsWriter,
};
use crate::schema::Schema;
use crate::Directory;
fn get_index(
docs: &[crate::Document],
schema: &Schema,
codec_enable_checker: FastFieldCodecEnableCheck,
) -> crate::Result<RamDirectory> {
let directory: RamDirectory = RamDirectory::create();
{
let write: WritePtr = directory.open_write(Path::new("test")).unwrap();
let mut serializer =
CompositeFastFieldSerializer::from_write_with_codec(write, codec_enable_checker)
.unwrap();
let mut fast_field_writers = FastFieldsWriter::from_schema(schema);
for doc in docs {
fast_field_writers.add_document(doc);
}
fast_field_writers
.serialize(&mut serializer, &HashMap::new(), None)
.unwrap();
serializer.close().unwrap();
}
Ok(directory)
}
fn test_fastfield_gcd_i64_with_codec(
codec_name: FastFieldCodecName,
num_vals: usize,
) -> crate::Result<()> {
let path = Path::new("test");
let mut docs = vec![];
for i in 1..=num_vals {
let val = i as i64 * 1000i64;
docs.push(doc!(*FIELDI64=>val));
}
let directory = get_index(&docs, &SCHEMAI64, codec_name.clone().into())?;
let file = directory.open_read(path).unwrap();
// assert_eq!(file.len(), 118);
let composite_file = CompositeFile::open(&file)?;
let file = composite_file.open_read(*FIELD).unwrap();
let fast_field_reader = DynamicFastFieldReader::<i64>::open(file)?;
assert_eq!(fast_field_reader.get(0), 1000i64);
assert_eq!(fast_field_reader.get(1), 2000i64);
assert_eq!(fast_field_reader.get(2), 3000i64);
assert_eq!(fast_field_reader.max_value(), num_vals as i64 * 1000);
assert_eq!(fast_field_reader.min_value(), 1000i64);
let file = directory.open_read(path).unwrap();
// Can't apply gcd
let path = Path::new("test");
docs.pop();
docs.push(doc!(*FIELDI64=>2001i64));
let directory = get_index(&docs, &SCHEMAI64, codec_name.into())?;
let file2 = directory.open_read(path).unwrap();
assert!(file2.len() > file.len());
Ok(())
}
#[test]
fn test_fastfield_gcd_i64() -> crate::Result<()> {
for codec_name in ALL_CODECS {
test_fastfield_gcd_i64_with_codec(codec_name.clone(), 5005)?;
}
Ok(())
}
fn test_fastfield_gcd_u64_with_codec(
codec_name: FastFieldCodecName,
num_vals: usize,
) -> crate::Result<()> {
let path = Path::new("test");
let mut docs = vec![];
for i in 1..=num_vals {
let val = i as u64 * 1000u64;
docs.push(doc!(*FIELD=>val));
}
let directory = get_index(&docs, &SCHEMA, codec_name.clone().into())?;
let file = directory.open_read(path).unwrap();
// assert_eq!(file.len(), 118);
let composite_file = CompositeFile::open(&file)?;
let file = composite_file.open_read(*FIELD).unwrap();
let fast_field_reader = DynamicFastFieldReader::<u64>::open(file)?;
assert_eq!(fast_field_reader.get(0), 1000u64);
assert_eq!(fast_field_reader.get(1), 2000u64);
assert_eq!(fast_field_reader.get(2), 3000u64);
assert_eq!(fast_field_reader.max_value(), num_vals as u64 * 1000);
assert_eq!(fast_field_reader.min_value(), 1000u64);
let file = directory.open_read(path).unwrap();
// Can't apply gcd
let path = Path::new("test");
docs.pop();
docs.push(doc!(*FIELDI64=>2001u64));
let directory = get_index(&docs, &SCHEMA, codec_name.into())?;
let file2 = directory.open_read(path).unwrap();
assert!(file2.len() > file.len());
Ok(())
}
#[test]
fn test_fastfield_gcd_u64() -> crate::Result<()> {
for codec_name in ALL_CODECS {
test_fastfield_gcd_u64_with_codec(codec_name.clone(), 5005)?;
}
Ok(())
}
#[test]
pub fn test_fastfield2() {
let test_fastfield = DynamicFastFieldReader::<u64>::from(vec![100, 200, 300]);
assert_eq!(test_fastfield.get(0), 100);
assert_eq!(test_fastfield.get(1), 200);
assert_eq!(test_fastfield.get(2), 300);
}
}