remove deprecated/obsolete Dialect-related stuff

Author: gavinking

hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/DB2iLegacyDialect.java

@@ -7,8 +7,8 @@
 import org.hibernate.boot.model.FunctionContributions;
 import org.hibernate.dialect.DatabaseVersion;
 import org.hibernate.dialect.function.CommonFunctionFactory;
-import org.hibernate.dialect.identity.DB2390IdentityColumnSupport;
 import org.hibernate.dialect.identity.DB2IdentityColumnSupport;
+import org.hibernate.dialect.identity.DB2zIdentityColumnSupport;
 import org.hibernate.dialect.identity.IdentityColumnSupport;
 import org.hibernate.dialect.pagination.FetchLimitHandler;
 import org.hibernate.dialect.pagination.LegacyDB2LimitHandler;
@@ -129,7 +129,7 @@ public LimitHandler getLimitHandler() {
 	public IdentityColumnSupport getIdentityColumnSupport() {
 		return getVersion().isSameOrAfter(7, 3)
 				? DB2IdentityColumnSupport.INSTANCE
-				: DB2390IdentityColumnSupport.INSTANCE;
+				: DB2zIdentityColumnSupport.INSTANCE;
 	}
 
 	@Override

hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/DB2zLegacyDialect.java

@@ -9,7 +9,7 @@
 import org.hibernate.dialect.DatabaseVersion;
 import org.hibernate.dialect.TimeZoneSupport;
 import org.hibernate.dialect.function.CommonFunctionFactory;
-import org.hibernate.dialect.identity.DB2390IdentityColumnSupport;
+import org.hibernate.dialect.identity.DB2zIdentityColumnSupport;
 import org.hibernate.dialect.identity.IdentityColumnSupport;
 import org.hibernate.dialect.pagination.FetchLimitHandler;
 import org.hibernate.dialect.pagination.LimitHandler;
@@ -146,7 +146,7 @@ public LimitHandler getLimitHandler() {
 
 	@Override
 	public IdentityColumnSupport getIdentityColumnSupport() {
-		return DB2390IdentityColumnSupport.INSTANCE;
+		return DB2zIdentityColumnSupport.INSTANCE;
 	}
 
 	@Override

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

@@ -3820,17 +3820,6 @@ public boolean supportsNullPrecedence() {
 		return true;
 	}
 
-	/**
-	 * A setting specific to {@link SybaseASEDialect}.
-	 *
-	 * @deprecated This is only called from {@link SybaseASESqlAstTranslator}
-	 *             so it doesn't need to be declared here.
-	 */
-	@Deprecated(since = "6")
-	public boolean isAnsiNullOn() {
-		return true;
-	}
-
 	/**
 	 * Does this dialect/database require casting of non-string arguments
 	 * in the {@code concat()} function?

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

@@ -1052,11 +1052,6 @@ public boolean supportsNullPrecedence() {
 		return wrapped.supportsNullPrecedence();
 	}
 
-	@Override
-	@Deprecated(since = "6")
-	public boolean isAnsiNullOn() {
-		return wrapped.isAnsiNullOn();
-	}
 
 	@Override
 	public boolean requiresCastForConcatenatingNonStrings() {