KeyCopies	crates/gravity/lowerv4/src/table/emit_key.rs	resident	lifetime	D3166	a keyed table whose records hold key copies stays resident	hash aggregate	No known query reaches this: every GROUP BY and DISTINCT hash aggregate key tried (text, long text, a text expression, bytea, an integer array, numeric, jsonb, two keys together, a key with string_agg) spills its groups to disk as PostgreSQL does, and the statement answers.
