If ALLOW_FOLD is not set, all provided HLLs and the target bin
(if it exists) must have matching index bits and minhash bits. If
ALLOW_FOLD is set, server will union down to the minimum index
bits of all provided HLLs and the target bin (if it exists). Additionally,
if minhash bits differs on any HLL, the resulting union will have 0 minhash
bits.
Parameters
bin: string
The name of the bin. The bin must contain an HLL value.
Sets a union of the specified HLLs with the HLL bin value (if it exists) back into the HLL bin.
The
setUnionoperation supports the following HLL Policy write flags:CREATE_ONLYUPDATE_ONLYALLOW_FOLDNO_FAILIf
ALLOW_FOLDis not set, all provided HLLs and the target bin (if it exists) must have matching index bits and minhash bits. IfALLOW_FOLDis set, server will union down to the minimum index bits of all provided HLLs and the target bin (if it exists). Additionally, if minhash bits differs on any HLL, the resulting union will have 0 minhash bits.