8000 Raise MergeError on mismatched signed/unsigned int merge keys by RITAMIT2023 · Pull Request #61694 · pandas-dev/pandas · GitHub
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Raise MergeError on mismatched signed/unsigned int merge keys #61694

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Raise MergeError on mismatched signed/unsigned int merge keys #61694

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e4aa9b6
Raise MergeError on mismatched signed/unsigned int merge keys
Jun 23, 2025
bc80270
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Jun 23, 2025
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[pre-commit.ci] auto fixes from pre-commit.com hooks 
for more information, see https://pre-commit.ci
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pre-commit-ci[bot] committed Jun 23, 2025
commit bc802704251fd03d0dfef647fcb918fc523fb89f
5 changes: 2 additions & 3 deletions pandas/core/reshape/merge.py
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Expand Up @@ -1671,9 +1671,8 @@ def _maybe_coerce_merge_keys(self) -> None:
rk = extract_array(rk, extract_numpy=True)

# Explicitly disallow merging int64 and uint64 (or vice versa)
if (
(lk.dtype == np.dtype("int64") and rk.dtype == np.dtype("uint64"))
or (lk.dtype == np.dtype("uint64") and rk.dtype == np.dtype("int64"))
if (lk.dtype == np.dtype("int64") and rk.dtype == np.dtype("uint64")) or (
lk.dtype == np.dtype("uint64") and rk.dtype == np.dtype("int64")
):
raise ValueError(
f"You are trying to merge on int64 and uint64 columns for key '{name}'. "
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