HHH-19365 - ignore gauss identity

Author: SweetWuXiaoMei

hibernate-core/src/main/java/org/hibernate/dialect/GaussDBDialect.java

@@ -585,7 +585,6 @@ public void initializeFunctionRegistry(FunctionContributions functionContributio
 		functionFactory.xmlpi();
 		functionFactory.xmlquery_gaussdb();
 		functionFactory.xmlexists();
-		functionFactory.xmlagg();
 
 		functionFactory.makeDateTimeTimestamp();
 		// Note that GaussDB doesn't support the OVER clause for ordered set-aggregate functions

hibernate-core/src/main/java/org/hibernate/dialect/identity/GaussDBIdentityColumnSupport.java

@@ -4,8 +4,6 @@
  */
 package org.hibernate.dialect.identity;
 
-import static org.hibernate.internal.util.StringHelper.unquote;
-
 /**
  * @author liubao
  *
@@ -21,11 +19,11 @@ public boolean supportsIdentityColumns() {
 
 	@Override
 	public String getIdentitySelectString(String table, String column, int type) {
-		return "select currval('" + unquote(table) + '_' + unquote(column) + "_seq')";
+		return "";
 	}
 
 	@Override
 	public String getIdentityColumnString(int type) {
-		return "generated by default as identity";
+		return "";
 	}
 }

hibernate-core/src/test/java/org/hibernate/orm/test/jpa/naturalid/MutableNaturalIdTest.java

@@ -5,6 +5,7 @@
 package org.hibernate.orm.test.jpa.naturalid;
 
 import org.hibernate.community.dialect.AltibaseDialect;
+import org.hibernate.dialect.GaussDBDialect;
 import org.hibernate.dialect.HANADialect;
 import org.hibernate.dialect.OracleDialect;
 
@@ -26,6 +27,8 @@
 		reason = "Hana do not support identity key generation")
 @SkipForDialect(dialectClass = AltibaseDialect.class,
 		reason = "Altibase do not support identity key generation")
+@SkipForDialect(dialectClass = GaussDBDialect.class,
+		reason = "Gauss do not support identity key generation")
 public class MutableNaturalIdTest extends AbstractJPATest {
 	@Override
 	protected Class<?>[] getAnnotatedClasses() {