Adding upstream version 1.9.1.upstream/1.9.1

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

1 files changed, 33 insertions, 0 deletions

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+Increment the specified `field` of a hash stored at `key`, and representing a
+floating point number, by the specified `increment`. If the increment value is
+negative, the result is to have the hash field value **decremented** instead of
+incremented. If the field does not exist, it is set to `0` before performing the
+operation. An error is returned if one of the following conditions occur:
+
+- The field contains a value of the wrong type (not a string).
+- The current field content or the specified increment are not parsable as a
+  double precision floating point number.
+
+The exact behavior of this command is identical to the one of the `INCRBYFLOAT`
+command, please refer to the documentation of `INCRBYFLOAT` for further
+information.
+
+@return
+
+@bulk-string-reply: the value of `field` after the increment.
+
+@examples
+
+```cli
+HSET mykey field 10.50
+HINCRBYFLOAT mykey field 0.1
+HINCRBYFLOAT mykey field -5
+HSET mykey field 5.0e3
+HINCRBYFLOAT mykey field 2.0e2
+```
+
+## Implementation details
+
+The command is always propagated in the replication link and the Append Only
+File as a `HSET` operation, so that differences in the underlying floating point
+math implementation will not be sources of inconsistency.