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QST: The concept behind how hashes are combined in pandas?

hashinghash_pandas_objecthash_pandas_object

Usage Question

Status: Open.

#57260 In pandas-dev/pandas;

· phphuc612 opened on Feb 5, 2024

BUG: ht.PyObjectHashTable swallows exception

Bug

Error ReportingIncorrect or improved errors from pandasIncorrect or improved errors from pandas

hashinghash_pandas_objecthash_pandas_object

Status: Open.

#57052 In pandas-dev/pandas;

· FreekPaans opened on Jan 24, 2024

BUG: hash_array does not produce deterministic integers

Docs

hashinghash_pandas_objecthash_pandas_object

Status: Open.

#55605 In pandas-dev/pandas;

· Danferno opened on Oct 20, 2023

PERF: <code>pd.util.hash_pandas_object</code> slower on <code>string[pyarrow]</code> than <code>object</code> dtypes

Arrowpyarrow functionalitypyarrow functionality

hashinghash_pandas_objecthash_pandas_object

PerformanceMemory or execution speed performanceMemory or execution speed performance

StringsString extension data type and string dataString extension data type and string data

Status: Open.

#48964 In pandas-dev/pandas;

· jrbourbeau opened on Oct 5, 2022

BUG: set_index on more than 1 column changes boolean values

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Bug

hashinghash_pandas_objecthash_pandas_object

MultiIndex

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Status: Open.

#46987 In pandas-dev/pandas;

· alonme opened on May 10, 2022

BUG: hash_pandas_object ignores column name values

Enhancement

hashinghash_pandas_objecthash_pandas_object

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Status: Open.

#46705 In pandas-dev/pandas;

· lmeyerov opened on Apr 8, 2022

BUG: map nested dict on categorical Series prints a TypeError and ignores it

Bug

CategoricalCategorical Data TypeCategorical Data Type

hashinghash_pandas_objecthash_pandas_object

Nested DataData where the values are collections (lists, sets, dicts, objects, etc.).Data where the values are collections (lists, sets, dicts, objects, etc.).

Status: Open.

#40892 In pandas-dev/pandas;

· adrien-berchet opened on Apr 12, 2021

BUG: DataFrame.drop_duplicates confuses NULL bytes

Bug

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

hashinghash_pandas_objecthash_pandas_object

StringsString extension data type and string dataString extension data type and string data

Status: Open.

#34551 In pandas-dev/pandas;

· marco-neumann-by opened on Jun 3, 2020

incosistencies in dataframe.dtype.isin() - I am getting inconsistent with different runs on same code.

Bug

hashinghash_pandas_objecthash_pandas_object

isinisin methodisin method

Upstream issueIssue related to pandas dependencyIssue related to pandas dependency

Status: Open.

#32443 In pandas-dev/pandas;

· maleknia opened on Mar 4, 2020

BUG: hash_pandas_object hash differs for NaN

Bug

hashinghash_pandas_objecthash_pandas_object

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

Status: Open.

#28363 In pandas-dev/pandas;

· naupa opened on Sep 9, 2019

Cannot hash table with index containing mixed types including non utf-8 bytes strings

Bug

hashinghash_pandas_objecthash_pandas_object

StringsString extension data type and string dataString extension data type and string data

Status: Open.

#27215 In pandas-dev/pandas;

· stestagg opened on Jul 3, 2019

hash_pandas_object fails on empty dataframe with index=False

Bug

hashinghash_pandas_objecthash_pandas_object

Status: Open.

#24318 In pandas-dev/pandas;

· TomAugspurger opened on Dec 17, 2018