> Is it possible to refine/combine the above two sets of queries into one?
Yes. It's possible:
A)
SELECT e.to_node_id AS node_id FROM edge e WHERE
e.from_node_id = $node_id
UNION
SELECT e.from_node_id AS node_id FROM edge e WHERE
e.to_node_id = $node_id
B)
SELECT count(edge_id)
FROM edge
WHERE
edge.to_node_id IN (Query_A)
OR
edge.from_node_id IN (Query_A)
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