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Applies to: 
Databricks Runtime 18.1 and above
Returns the estimated number of unique keys from a TupleSketch with integer summaries.
Syntax
tuple_sketch_estimate_integer ( sketch )
Arguments
- sketch: A TupleSketch in binary format with integer summaries.
Returns
A DOUBLE value representing the estimated distinct count of keys.
Error messages
Examples
> SELECT tuple_sketch_estimate_integer(tuple_sketch_agg_integer(key, summary)) FROM VALUES (1, 1), (1, 2), (2, 3) tab(key, summary);
2.0