Query Grid and Teradata External Table

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Query Grid and Teradata External Table

I am planning to implement Teradata external table in my project. Could anyone give me some insight on Teradata external table. Planning to connect hive table or HDFS files from that.

Is there any relation between Teradata external table and query grid? It would be nice if you can provide me few details on query grid, it's capability, limitation and performance.

Thanks in Advance.

- Indranil.