Adding upstream version 1.9.1.upstream/1.9.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/iredis/data/commands/pfmerge.md b/iredis/data/commands/pfmerge.md
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+Merge multiple HyperLogLog values into an unique value that will approximate the
+cardinality of the union of the observed Sets of the source HyperLogLog
+structures.
+
+The computed merged HyperLogLog is set to the destination variable, which is
+created if does not exist (defaulting to an empty HyperLogLog).
+
+If the destination variable exists, it is treated as one of the source sets and
+its cardinality will be included in the cardinality of the computed HyperLogLog.
+
+@return
+
+@simple-string-reply: The command just returns `OK`.
+
+@examples
+
+```cli
+PFADD hll1 foo bar zap a
+PFADD hll2 a b c foo
+PFMERGE hll3 hll1 hll2
+PFCOUNT hll3
+```