I figured out how to get a Œblind¹ bind to work efficiently - add a dummy
pattern referencing the source variable before the bind.
First off, the example I provided previously is somewhat of a made up case
and rewriting to use values instead of bind is fine.
My real use case is looking up all the subjects that are about the same
real-world entity, but are from different sources. That¹s implemented as a
graph of owl:sameAs between each set of subjects that are about one
entity. The following pattern produces the list of all subjects for the
same entity, including the entry subject. In particular, it returns the
entry subject when it¹s the only subject for the entity and, therefore,
has no owl:sameAs.
{ ?entry_subj (owl:sameAs|^owl:sameAs)+ ?other_subj .}
union
{ ?entry_subj <void://void> <void://void> . ## this dummy pattern
avoids a table scan
bind (?entry_subj as ?other_subj) }
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