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feat: reuse table constraint grammar for PostgreSQL ALTER ADD (#2612) #821

Job	Run time
Gradle Check (windows-latest)	4m 24s
Gradle Check (macos-latest)	3m 23s
Gradle Check (ubuntu-latest)	3m 17s
Grammar Choice Conflicts	36s
Maven Verify (macos-latest)	4m 4s
Maven Verify (windows-latest)	4m 30s
Maven Verify (ubuntu-latest)	2m 45s
Build & Deploy Sphinx Docs	3m 8s
Gradle Publish (Maven Central)	3m 32s
	29m 39s