histogram: a nullable Float64 column holding a NaN gets no histogram (regression from #1069) #1077

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1. paddymul

   added

   Histograms

   on Oct 6, 2026
2. paddymul commented on Oct 7, 2026

   

   paddymul

   on Oct 7, 2026

   CollaboratorAuthor

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   Probe script for this issue. Save it as probe_1077.py in a buckaroo checkout and run uv run python probe_1077.py. The output below is from main at e88ace9.

   probe_1077.py

   """Since #1069, histogram_series drops a nullable Float64 column's NaN (not pd.NA) with the infinities and returns
   numeric histogram_args, but min/max are pd.NA and fmt_num's math.isfinite raises on them."""
   import logging
   logging.disable(logging.CRITICAL)
   import warnings
   warnings.filterwarnings('ignore')
   import numpy as np
   import pandas as pd
   from buckaroo.customizations.pd_stats_v2 import PD_ANALYSIS_V2
   from buckaroo.pluggable_analysis_framework.stat_pipeline import StatPipeline
   
   num = pd.Series([0.0] + [float(i) for i in range(1, 100)], dtype='Float64')
   den = pd.Series([0.0] + [1.0] * 99, dtype='Float64')
   ser = num / den
   print('values', ser.head(3).tolist(), 'isna', ser.isna().head(3).tolist())
   print('dropna().min() =', ser.dropna().min(), '| np.isfinite keeps', int(np.isfinite(ser.dropna()).sum()), 'of', len(ser))
   sd, errs = StatPipeline(PD_ANALYSIS_V2, unit_test=False).process_df(pd.DataFrame({'a': ser}))
   for e in errs:
       print('error', e.stat_key, type(e.error).__name__, str(e.error)[:120])
   print('histogram_args empty:', sd['a']['histogram_args'] == {}, '| histogram:', sd['a']['histogram'])

   Output at e88ace9

   values [nan, 1.0, 2.0] isna [False, False, False]
   dropna().min() = <NA> | np.isfinite keeps 99 of 100
   error mean TypeError float() argument must be a string or a real number, not 'NAType'
   error std TypeError float() argument must be a string or a real number, not 'NAType'
   error median TypeError float() argument must be a string or a real number, not 'NAType'
   error histogram TypeError must be real number, not NAType
   histogram_args empty: False | histogram: None