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42 lines
1.5 KiB
Go
42 lines
1.5 KiB
Go
package goredis
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// PFAdd adds all the element arguments to the HyperLogLog data structure
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// stored at the variable name specified as first argument.
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func (r *Redis) PFAdd(key string, elements ...string) (int64, error) {
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args := packArgs("PFADD", key, elements)
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rp, err := r.ExecuteCommand(args...)
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if err != nil {
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return 0, err
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}
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return rp.IntegerValue()
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}
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// PFCount returns the approximated cardinality computed by the HyperLogLog
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// data structure stored at the specified variable,
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// which is 0 if the variable does not exist.
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// When called with multiple keys, returns the approximated cardinality of
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// the union of the HyperLogLogs passed, by internally merging the HyperLogLogs
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// stored at the provided keys into a temporary hyperLogLog.
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func (r *Redis) PFCount(keys ...string) (int64, error) {
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args := packArgs("PFCOUNT", keys)
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rp, err := r.ExecuteCommand(args...)
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if err != nil {
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return 0, err
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}
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return rp.IntegerValue()
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}
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// PFMerge merges multiple HyperLogLog values into an unique value
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// that will approximate the cardinality of the union of the observed
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// Sets of the source HyperLogLog structures.
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// The computed merged HyperLogLog is set to the destination variable,
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// which is created if does not exist (defauling to an empty HyperLogLog).
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func (r *Redis) PFMerge(destkey string, sourcekeys ...string) error {
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args := packArgs("PFMERGE", destkey, sourcekeys)
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rp, err := r.ExecuteCommand(args...)
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if err != nil {
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return err
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}
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return rp.OKValue()
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}
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