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https://issues.apache.org/jira/browse/PARQUET-2345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17763125#comment-17763125
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Gang Wu commented on PARQUET-2345:
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I didn't find any statement to disallow identical field names in the parquet
specs. For engines projecting columns on field ordinals or field ids, identical
field names may not be a big issue. It is a good convention to avoid them.
> The Parquet Spec doesn't specify whether multiple columns are allowed to have
> the same name.
> --------------------------------------------------------------------------------------------
>
> Key: PARQUET-2345
> URL: https://issues.apache.org/jira/browse/PARQUET-2345
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-format
> Affects Versions: 1.13.1
> Reporter: Jan Finis
> Priority: Minor
>
> The parquet format specification doesn't say whether a Parquet file having
> columns with the same name (in the same group node, so really exactly the
> same name) is valid. I.e., say I have a Parquet file with two columns. Both
> are called x. Is this file a valid Parquet file?
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