// SetPrefixExtractor sets the prefic extractor.
//
// If set, use the specified function to determine the
// prefixes for keys. These prefixes will be placed in the filter.
// Depending on the workload, this can reduce the number of read-IOP
// cost for scans when a prefix is passed via ReadOptions to
// db.NewIterator().
// Default: nil
func (opts *Options) SetPrefixExtractor(value SliceTransform) {
if nst, ok := value.(nativeSliceTransform); ok {
opts.cst = nst.c
} else {
idx := registerSliceTransform(value)
opts.cst = C.gorocksdb_slicetransform_create(C.uintptr_t(idx))
}
C.rocksdb_options_set_prefix_extractor(opts.c, opts.cst)
}
// If set, use the specified function to determine the
// prefixes for keys. These prefixes will be placed in the filter.
// Depending on the workload, this can reduce the number of read-IOP
// cost for scans when a prefix is passed via ReadOptions to
// db.NewIterator().
// Default: nil
func (self *Options) SetPrefixExtractor(value SliceTransform) {
if nst, ok := value.(nativeSliceTransform); ok {
self.cst = nst.c
} else {
h := unsafe.Pointer(&value)
self.st = &value
self.cst = C.gorocksdb_slicetransform_create(h)
}
C.rocksdb_options_set_prefix_extractor(self.c, self.cst)
}