[In preview] Load a subset of data - currently you can either point to a source file or a source folder
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A few ways this can be done: defining a regular expression or wild card support
Any progress on this question?
Ali Nabbi commented
Let's say we have following files in Azure blob storage with same file format but different number/type of data in their columns:
If PolyBase supports defining data source to blob storage with defined file title format (for instance: WHERE file.name = 'fileA_*.csv'), we will be able to transfer various files from same location to desired external tables.