Last tested: Dec 2020
Streaming determines whether or not we can export unlimited results. It is basically the notion of serving data in chunks, rather than pulling all of it into memory. The last section of the Row Limits Help Center Article explains more and lays out exactly when we do and do not stream.
Table calcs never stream.
Custom fields always stream.
Merged results never stream.
Certain databases can't stream, or can't stream with pivots.
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