HHH-14446 Add PostgresqlDatabaseCleaner checks

Since the PostgreSQL JDBC driver is also used for CockroachDB, we need to test explicitly if the database is indeed PostgreSQL.

hibernate-testing/src/main/java/org/hibernate/testing/cleaner/PostgreSQLDatabaseCleaner.java

@@ -31,7 +31,8 @@ public class PostgreSQLDatabaseCleaner implements DatabaseCleaner {
 	@Override
 	public boolean isApplicable(Connection connection) {
 		try {
-			return connection.getMetaData().getDatabaseProductName().startsWith( "PostgreSQL" );
+			return connection.getMetaData().getDatabaseProductName().startsWith( "PostgreSQL" )
+					&& isPostgresql( connection );
 		}
 		catch (SQLException e) {
 			throw new RuntimeException( "Could not resolve the database metadata!", e );
@@ -211,4 +212,19 @@ public class PostgreSQLDatabaseCleaner implements DatabaseCleaner {
 		}
 	}
 
+	// We need this check to differentiate between Postgresql and Cockroachdb
+	private boolean isPostgresql(Connection connection) {
+		try (Statement stmt = connection.createStatement()) {
+			ResultSet rs = stmt.executeQuery( "select version() " );
+			while ( rs.next() ) {
+				String version = rs.getString( 1 );
+				return version.contains( "PostgreSQL" );
+			}
+		}
+		catch (SQLException e) {
+			throw new RuntimeException( e );
+		}
+		return false;
+	}
+
 }