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Separate ALTER key definitions from column drop targets #1205

Job	Run time
Grammar Choice Conflicts	30s
Gradle Check (windows-latest)	5m 2s
Gradle Check (ubuntu-latest)	3m 52s
Gradle Check (macos-latest)	4m 6s
Maven Verify (ubuntu-latest)	3m 13s
Maven Verify (windows-latest)	5m 19s
Maven Verify (macos-latest)	7m 12s
Gradle Publish (Maven Central)	0s
Build & Deploy Sphinx Docs	0s
	29m 14s