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How many rows are you trying to download to the alteryx designer?
Once you stream out data is stored in your machine. I would recommend you to try to reduce the amount of rows by filtering out as many rows as possible. Reducing the total size that you want to stream out should do it.
From the text of this message, it looks like it could be an error in the SAP HANA database as opposed to Alteryx. If you search for "General error;2048 column store error: search table error: column store error: search table error:  Memory allocation failed (please check lines: 7)" you'll find a series of responses on the SAP site dealing with this. This one suggests ways to limit your search sizes