SNOW-2257191: Bugfix join bug due to dataframe alias #3685
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Which Jira issue is this PR addressing? Make sure that there is an accompanying issue to your PR.
Fixes SNOW-2257191
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Please describe how your code solves the related issue.
In this PR we fix update of
df_aliased_col_name_to_real_col_namechild to parent by making sure all dictionaries within the default dict are copied by value instead of reference.