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DuckDB: support the ==, ** and ~~ operators and chained signs #1272

Job	Run time
Grammar Choice Conflicts	33s
Gradle Check (ubuntu-latest)	4m 4s
Gradle Check (macos-latest)	4m 25s
Gradle Check (windows-latest)	5m 7s
Maven Verify (macos-latest)	6m 16s
Maven Verify (windows-latest)	5m 45s
Maven Verify (ubuntu-latest)	2m 40s
Gradle Publish (Maven Central)	0s
Build & Deploy Sphinx Docs	0s
	28m 50s