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BUG fix _Unstacker int32 limit in dataframe sizes (pandas-dev#26314) #34827

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BUG fix _Unstacker int32 limit in dataframe sizes (pandas-dev#26314) #34827

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10 changes: 5 additions & 5 deletions pandas/core/reshape/reshape.py
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Original file line number Diff line number Diff line change
Expand Up @@ -104,18 +104,18 @@ def __init__(
self.removed_level = self.new_index_levels.pop(self.level)
self.removed_level_full = index.levels[self.level]

# Bug fix GH 20601
# Bug fix GH 20601 & 26314
# If the data frame is too big, the number of unique index combination
# will cause int32 overflow on windows environments.
# will cause int64 overflow
# We want to check and raise an error before this happens
num_rows = np.max([index_level.size for index_level in self.new_index_levels])
num_columns = self.removed_level.size

# GH20601: This forces an overflow if the number of cells is too high.
num_cells = np.multiply(num_rows, num_columns, dtype=np.int32)
# GH20601 & GH26314: This forces an overflow if the number of cells is too high.
num_cells = np.multiply(num_rows, num_columns, dtype=np.int64)

if num_rows > 0 and num_columns > 0 and num_cells <= 0:
raise ValueError("Unstacked DataFrame is too big, causing int32 overflow")
raise ValueError("Unstacked DataFrame is too big, causing int64 overflow")

self._make_selectors()

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