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What is a sink dataset in ADF?
A cache sink is when a data flow writes data into the Spark cache instead of a data store. In mapping data flows, you can reference this data within the same flow many times using a cache lookup. This is useful when you want to reference data as part of an expression but don't want to explicitly join the columns to it.
What is ADF metadata?
You can use the Get Metadata activity to retrieve the metadata of any data in Azure Data Factory or a Synapse pipeline. You can use the output from the Get Metadata activity in conditional expressions to perform validation, or consume the metadata in subsequent activities.
