fix: preserve JSON_TABLE EXISTS column order #969

Job	Run time
Grammar Choice Conflicts	35s
Gradle Check (ubuntu-latest)	3m 26s
Gradle Check (windows-latest)	4m 51s
Gradle Check (macos-latest)	2m 49s
Maven Verify (ubuntu-latest)	3m 21s
Maven Verify (macos-latest)	4m 22s
Maven Verify (windows-latest)	4m 42s
Gradle Publish (Maven Central)	0s
Build & Deploy Sphinx Docs	0s
	24m 6s

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