Github user wgtmac commented on the issue:

    https://github.com/apache/spark/pull/15155
  
    @HyukjinKwon Yup this PR is very similar to yours.
    
    For merging parquet schema, it won't work. Think about this: the table 
contains two parquet files, one has int, one has long. The DataFrame schema 
uses long (mergeSchema will also result in this case). So when reading the 
parquet file with Int, we still run into this problem.


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