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Stable non-cryptographic and cryptographic hashing functions for Polars

Project description

This plugin provides stable hashing functionality across different polars versions.

Examples

Cryptographic Hashers

import polars
import polars_hash as plh

df = pl.DataFrame({
    "foo":["hello_world"]
})

result = df.select(plh.col('foo').chash.sha256())

print(result)

┌──────────────────────────────────────────────────────────────────┐
 foo                                                              
 ---                                                              
 str                                                              
╞══════════════════════════════════════════════════════════════════╡
 35072c1ae546350e0bfa7ab11d49dc6f129e72ccd57ec7eb671225bbd197c8f1 
└──────────────────────────────────────────────────────────────────┘

Non-cryptographic Hashers

df = pl.DataFrame({
    "foo":["hello_world"]
})

result = df.select(plh.col('foo').nchash.wyhash())
print(result)
┌──────────────────────┐
 foo                  
 ---                  
 u64                  
╞══════════════════════╡
 16737367591072095403 
└──────────────────────┘

Geo Hashers

df = pl.DataFrame(
    {"coord": [{"longitude": -120.6623, "latitude": 35.3003}]},
    schema={
        "coord": pl.Struct(
            [pl.Field("longitude", pl.Float64), pl.Field("latitude", pl.Float64)]
        ),
    },
)

df.with_columns(
    plh.col('coord').geohash.from_coords().alias('geohash')
)
shape: (1, 2)
┌─────────────────────┬────────────┐
 coord                geohash    
 ---                  ---        
 struct[2]            str        
╞═════════════════════╪════════════╡
 {-120.6623,35.3003}  9q60y60rhs 
└─────────────────────┴────────────┘


pl.select(pl.lit('9q60y60rhs').geohash.to_coords().alias('coordinates'))
shape: (1, 1)
┌───────────────────────┐
 coordinates           
 ---                   
 struct[2]             
╞═══════════════════════╡
 {-120.6623,35.300298} 
└───────────────────────┘

Create hash from multiple columns

df = pl.DataFrame({
    "foo":["hello_world"],
    "bar": ["today"]
})

result = df.select(plh.concat_str('foo','bar').chash.sha256())

Project details


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