Hello @Michał Sobieraj ,
As long as you are using an Event Hub as the input, you should be able to get the metadata (offset, sequence number, and others) using this function GetMetadataPropertyValue. It has nothing to do with Avro or Parquet output format. More detail can be found here: GetMetadataPropertyValue (Azure Stream Analytics) - Stream Analytics Query | Microsoft Learn
Hope this will help. Please let us know if any further queries.
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