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postgres-lambda-diff

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    Tom Lane authored
    clamp the estimated number of groups to table row count over 10, instead
    of table row count; this reflects a heuristic that people probably won't
    group over a near-unique set of columns, and the knowledge that we don't
    currently have any way to estimate the correlation of the columns better
    than guessing.  This change creates a trivial plan change in one of the
    regression tests.
    875b0c62
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