Improve select handling for sharded queries #15318

Job	Run time
changes	4s
integration-sqlite (capabilities_features, 8.1, main)	1m 36s
integration-sqlite (collaboration_features, 8.1, main)	3m 21s
integration-sqlite (comments_features, 8.1, main)	2m 0s
integration-sqlite (dav_features, 8.1, main)	5m 39s
integration-sqlite (features, 8.1, main)	5m 52s
integration-sqlite (federation_features, 8.1, main)	4m 36s
integration-sqlite (--tags ~@large files_features, 8.1, main)	8m 57s
integration-sqlite (filesdrop_features, 8.1, main)	1m 45s
integration-sqlite (openldap_features, 8.1, main)	1m 5s
integration-sqlite (openldap_numerical_features, 8.1, main)	1m 37s
integration-sqlite (ldap_features, 8.1, main)	1m 37s
integration-sqlite (remoteapi_features, 8.1, main)	1m 34s
integration-sqlite (setup_features, 8.1, main)	1m 20s
integration-sqlite (sharees_features, 8.1, main)	3m 4s
integration-sqlite (sharing_features, 8.1, main)	12m 23s
integration-sqlite (videoverification_features, 8.1, main)	4m 34s
integration-sqlite-summary	5s
	1h 1m 9s

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