src/include/utils/selfuncs.h · 88177f77b17ef478da1dbca9acb5e3a61b346613 · Jakob Huber / postgres-lambda-diff

22 years ago

Add an at-least-marginally-plausible method of estimating the number · b60be3f2

Tom Lane authored 22 years ago

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.

b60be3f2

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Add an at-least-marginally-plausible method of estimating the number

Tom Lane authored 22 years ago

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.