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Hello,
From the error message it looks like your Parquet data has duplicate keys. Usually, if it's JSON data and if the duplicates are caused by naming convention -- some fields are in uppercase and some are in lowercase, we then have SerDe property [case.insensitive'='false'] for 'org.openx.data.jsonserde.JsonSerDe'. More details in the link 1.
I have tested similar data mentioned in the article by converting to Parquet and did not face any issue. Please open a support ticket with Athena team and provide your query ID, table DDL and sample data if possible for us to troubleshoot.
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Maybe it's a bug fixed 2 years ago and not backported by aws: https://github.com/trinodb/trino/issues/6200
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