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Commit 5fa0f9d1 authored by Douglas RAILLARD's avatar Douglas RAILLARD
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lisa.datautils: Fix df_window_signal() dtype propagation

Make sure we only concatenate dataframes with the same column dtype so
the output has the same dtype, rather than being reset to the generic
"object".

In order to achieve that, introduce df_make_empty_clone() that makes an
empty clone of any dataframe, preserving the columns dtypes.
parent d706186e
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