QFE: Fix @ modifier for subquery #10795

Job	Run time
lint	4m 24s
test	16m 8s
CodeQL	6m 43s
build	4m 3s
test-no-race	7m 31s
integration-configs-db	2m 47s
integration (requires_docker)	7m 22s
integration (integration_alertmanager)	4m 3s
integration (integration_backward_compatibility)	10m 31s
integration (integration_memberlist)	8m 10s
integration (integration_querier)	15m 6s
integration (integration_ruler)	5m 46s
integration (integration_query_fuzz)	5m 4s
deploy_website	0s
deploy	0s
	1h 37m 38s

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