Codegen for query_required_single()

[jrycw]

Currently, it appears that the code generation process will not generate a query using query_required_single().

After examining the _generate() function situated at edgedb-python/edgedb/codegen/generator.py, it appears there might be an if-else statement that determines the method to use:

edgedb-python/edgedb/codegen/generator.py

Lines 390 to 398 in ca40114

	if dr.output_cardinality.is_multi():
	method = "query"
	rt = "return "
	elif dr.output_cardinality == edgedb.Cardinality.NO_RESULT:
	method = "execute"
	rt = ""
	else:
	method = "query_single"
	rt = "return "

Could insights be provided into the rationale behind this decision?