Allow single-field named structs to be transparent #1463

Job	Run time
Functional Test (MySQL)	53s
Functional Test (PostgreSQL)	45s
Check	1m 25s
Functional Test (SQLite)	37s
Build (ubuntu-latest)	50s
Build (macOS-13)	1m 7s
Build (windows-latest)	1m 53s
Build (macOS-latest)	49s
Integration Test (ubuntu-latest)	38s
Integration Test (macOS-13)	1m 9s
Integration Test (macOS-latest)	36s
	10m 42s

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