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postgres/src/include/optimizer
Tom Lane b60be3f2f8 Add an at-least-marginally-plausible method of estimating the number
of groups produced by GROUP BY.  This improves the accuracy of planning
estimates for grouped subselects, and is needed to check whether a
hashed aggregation plan risks memory overflow.
2002-11-19 23:22:00 +00:00
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