fix of get_sub_hist() when Bin histogram is filled only with nans

- fix of util._get_sub_hist()

CHANGES.rst

@@ -2,6 +2,10 @@
 Release notes
 =============
 
+Version 1.0.33, Sep 2022
+------------------------
+* fix of get_sub_hist() when Bin histogram is filled only with nans.
+
 Version 1.0.32, Sep 2022
 ------------------------
 * Support for decimal datetype in pandas and spark.

README.rst

@@ -20,7 +20,7 @@ PyCUDA is available, they can also be filled from Numpy arrays by JIT-compiling
 
 This Python implementation of histogrammar been tested to guarantee compatibility with its Scala implementation.
 
-Latest Python release: v1.0.32 (Sep 2022).
+Latest Python release: v1.0.33 (Dec 2022).
 
 
 Announcements

histogrammar/util.py

@@ -628,12 +628,17 @@ def _get_sub_hist(hist):
     if isinstance(hist, histogrammar.Categorize):
         sub_hist = hist.values[0] if hist.values else hist.value
     elif isinstance(hist, histogrammar.Bin):
-        if hist.entries > 0:
+        if hist.entries > 0 and len(hist.values) > 0:
             # pick first sub-hist found that is filled
-            idx = next(i for i, b in enumerate(hist.values) if b.entries > 0)
+            # note: could still be that all bins are unfilled. if so pick first bin.
+            idx = 0
+            for i, b in enumerate(hist.values):
+                if b.entries > 0:
+                    idx = i
+                    break
             sub_hist = hist.values[idx]
         else:
-            sub_hist = hist.values[0] if hist.values else histogrammar.Count()
+            sub_hist = hist.values[0] if len(hist.values) > 0 else histogrammar.Count()
     elif isinstance(hist, (histogrammar.SparselyBin, histogrammar.CentrallyBin)):
         sub_hist = list(dict(hist.bins).values())[0] if hist.bins else hist.value
     elif isinstance(hist, (histogrammar.IrregularlyBin, histogrammar.Stack)):

histogrammar/version.py

@@ -3,9 +3,9 @@
 import re
 
 name = "histogrammar"
-__version__ = "1.0.32"
-version = "1.0.32"
-full_version = "1.0.32"
+__version__ = "1.0.33"
+version = "1.0.33"
+full_version = "1.0.33"
 release = True
 
 version_info = tuple(re.split(r"[-\.]", __version__))

setup.py

@@ -22,7 +22,7 @@
 
 MAJOR = 1
 REVISION = 0
-PATCH = 32
+PATCH = 33
 DEV = False
 # NOTE: also update version at: README.rst and update CHANGES.rst