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ParquetNativeRecordReader and ParquetAvroRecordReader expand a json struct MV element as a MV element of maps #17420

@krishan1390

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@krishan1390

Eg: If parquet data is a struct and has below data

"metadata": {"tags":["abc", "xyz"]}

The parquet readers ParquetNativeRecordReader and ParquetAvroRecordReader expand it to

"metadata": {"tags":[{"element":"abc"}, {"element":"xyz"}]}

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