Method Prev

pkg/sql/sem/tree/datum.go:147–147

Prev returns the previous datum and true, if one exists, or nil and false. The previous datum satisfies the following definition: if the receiver is "b" and the returned datum is "a", then for every compatible datum "x", it holds that "x < b" is true if and only if "x <= a" is true. The return valu

(ctx context.Context, cmpCtx CompareContext)

	// weaker contract. The original filter expression is left in place to catch
	// false positives.
	Prev(ctx context.Context, cmpCtx CompareContext) (Datum, bool)

	// IsMin returns true if the datum is equal to the minimum value the datum
	// type can hold.