BUG: Fix incorrect index length when ignore_index=True in series concat #63408
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Fix incorrect index length when ignore_index=True in series concat The concat axis was previously created with length len(objs), which counts input containers rather than concatenated rows. This caused index/data length mismatches for any non-trivial concat. The concat axis length is now computed as the sum of object lengths, restoring correctness for ignore_index=True.
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Fix incorrect index length when ignore_index=True in series concat
The concat axis was previously created with length len(objs), which counts input containers rather than concatenated rows. This caused index/data length mismatches for any non-trivial concat.
The concat axis length is now computed as the sum of object lengths, restoring correctness for ignore_index=True.
I am happy to add parametrized test cases if required and given exact file location.