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Unfortunately parsing data by Bytes right now is not supported in glue. I observed your data is unstructured and the only way to parse that data is Grok SerDe or Regex SerDe but they parse data by identifying patterns so they are not feasible. I will recommend you to preprocess your data and then load them in glue.
unstructured data -> preprocessing using some Custom built parser function(csv) -> S3 -> crawl and createDatabase in glue.
Thank you for your reply.
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If the numbers of characters are the same by record, I can use Grok pattern like "(?<col0>.{6})(?<col1>.{2})..." when making a data catalog using crawler. But in this case, numbers differ, and bytes are the same. Can anyone tell AWS Glue does support/not support data set like this?