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Including File Properties and Metadata in a U-SQL Script

June 12, 2018   Self-Service BI

When working on big data systems, it can be very helpful to include file properties and other metadata directly within the data results. Capturing data lineage can come in very handy, especially if reconciling or troubleshooting issues (for instance, if retry logic occurred in the data stream and now you have duplicate rows to be handled).

I just learned we have some new U-SQL syntax which supports the following file properties:

  • URI (uniform resource identifier)
  • Modified date
  • Created date
  • Length (file size in bytes)

In the following example, I’m using U-SQL (Azure Data Lake Analytics) to iterate over files which are in date-partitioned subfolders under Raw Data within Azure Data Lake Store. As part of the schema-on-read definition of the source files (aka the extract statement), the new file properties are shown in yellow:

U SQL File Properties Including File Properties and Metadata in a U SQL Script

The output for the virtual columns looks like this:

U SQL File Properties Output Including File Properties and Metadata in a U SQL Script

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Blog – SQL Chick

File, including, Metadata, Properties, script, USQL
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