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Allow more MySQL and PostgreSQL keywords as unquoted identifiers #1358

Job	Run time
Gradle Check (ubuntu-latest)	4m 1s
Gradle Check (macos-latest)	5m 4s
Grammar Choice Conflicts	38s
Gradle Check (windows-latest)	5m 11s
Maven Verify (ubuntu-latest)	4m 33s
Maven Verify (macos-latest)	6m 18s
Maven Verify (windows-latest)	4m 49s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	0s
	30m 34s