LunaQL docs are incomplete.
Reference
actions
fetch

fetch

The fetch action is used to fetch results of the specified criteria:

suppliers.lunaql
query({
	from({
		posts: {
			fetch!;
		};
	});
});
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The fetch action doesn't need to be called, as it is the default action.

You can also use fetchFirst. The fetchFirst action will return the first item in the results:

suppliers.lunaql
query({
	from({
		posts: {
			where(["first_name", "==", "John"]);
 
			fetchFirst!;
		};
	});
});

This will return the first document that matches the criteria.