QFE: Fix @ modifier for subquery #10796

Job	Run time
CodeQL	6m 35s
test-no-race	7m 13s
test	15m 46s
lint	4m 21s
build	4m 5s
integration (requires_docker)	7m 17s
integration (integration_alertmanager)	4m 16s
integration-configs-db	3m 1s
integration (integration_backward_compatibility)	11m 6s
integration (integration_memberlist)	7m 40s
integration (integration_querier)	15m 40s
integration (integration_ruler)	5m 33s
integration (integration_query_fuzz)	5m 3s
deploy_website	0s
deploy	0s
	1h 37m 36s

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