Julian Hyde created CALCITE-2035:
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Summary: Add APPROX_COUNT_DISTINCT aggregate function
Key: CALCITE-2035
URL: https://issues.apache.org/jira/browse/CALCITE-2035
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Assignee: Julian Hyde
Add {{APPROX_COUNT_DISTINCT}} aggregate function. The effect of
{{APPROX_COUNT_DISTINCT(args)}} is the same as {{COUNT(DISTINCT args)}} but the
planner may generate approximate results (e.g. by using HyperLogLog).
Note "may" not "must", above: the planner may choose a plan that returns exact
results.
This is a step towards CALCITE-1588, which would allow an {{APPROXIMATE}}
clause and specify in more detail the degree of approximation allowed.
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