yuanlihan opened a new issue #1870: hll_hash function used in column mapping of broker load does not support nested expression parameter URL: https://github.com/apache/incubator-doris/issues/1870 _hll_hash_ function used in column mapping of broker load does not support nested expression parameter. eg, _hll_hash(coalesce(userid, deviceid))_ will get error: `ERROR 1064 (HY000): Mapping function args error, arg: coalesce(`userid`, `deviceid`)`
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