HHH-5225 : Cannot parse order-by fragment if it contains a registered function without parentheses

git-svn-id: https://svn.jboss.org/repos/hibernate/core/trunk@20197 1b8cb986-b30d-0410-93ca-fae66ebed9b2

core/src/main/java/org/hibernate/sql/Template.java

@@ -717,11 +717,9 @@ private static boolean isFunction(String lcToken, String nextToken, SQLFunctionR
 			// lcToken does not refer to a function
 			return false;
 		}
-		// if function.hasArguments() and function.hasParenthesesIfNoArguments() is true,
+		// if function.hasParenthesesIfNoArguments() is true, then assume
-		// then assume that lcToken is not a function, since it is not followed by "(";
+		// lcToken is not a function (since it is not followed by '(')
-		// can't seem to use function.hasParenthesesIfNoArguments() alone because
+		return ! function.hasParenthesesIfNoArguments();
-		// function definitions may return true if "()" is optional when there are no arguments.
-		return function.hasArguments() && function.hasParenthesesIfNoArguments() ? false : true;
 	}
 
 	private static boolean isIdentifier(String token, Dialect dialect) {

core/src/main/java/org/hibernate/sql/ordering/antlr/OrderByFragmentParser.java

@@ -103,7 +103,20 @@ protected AST quotedString(AST ident) {
 	 * {@inheritDoc}
 	 */
 	protected boolean isFunctionName(AST ast) {
-		return context.getSqlFunctionRegistry().hasFunction( ast.getText() );
+		AST child = ast.getFirstChild();
+		// assume it is a function if it has parameters
+		if ( child != null && "{param list}".equals( child.getText() ) ) {
+			return true;
+		}
+
+		final SQLFunction function = context.getSqlFunctionRegistry().findSQLFunction( ast.getText() );
+		if ( function == null ) {
+			return false;
+		}
+
+		// if function.hasParenthesesIfNoArguments() is true, then assume
+		// ast.getText() is not a function.
+		return ! function.hasParenthesesIfNoArguments();
 	}
 
 	/**
@@ -111,8 +124,10 @@ protected boolean isFunctionName(AST ast) {
 	 */
 	protected AST resolveFunction(AST ast) {
 		AST child = ast.getFirstChild();
+		if ( child != null ) {
 			assert "{param list}".equals(  child.getText() );
 			child = child.getFirstChild();
+		}
 
 		final String functionName = ast.getText();
 		final SQLFunction function = context.getSqlFunctionRegistry().findSQLFunction( functionName );

testsuite/src/test/java/org/hibernate/test/hql/FunctionNameAsColumnTest.java

@@ -37,6 +37,8 @@
 import org.hibernate.cfg.Configuration;
 import org.hibernate.cfg.Environment;
 import org.hibernate.criterion.Restrictions;
+import org.hibernate.dialect.function.SQLFunction;
+import org.hibernate.engine.SessionFactoryImplementor;
 import org.hibernate.testing.junit.functional.FunctionalTestCase;
 import org.hibernate.testing.junit.functional.FunctionalTestClassTestSuite;
 
@@ -196,6 +198,13 @@ public void testGetMultiColumnSameNameAsArgFunctionCriteria() {
 	}
 
 	public void testGetMultiColumnSameNameAsNoArgFunctionHQL() throws Exception {
+		SQLFunction function =
+				( ( SessionFactoryImplementor ) getSessions() ).getSqlFunctionRegistry().findSQLFunction( "current_date" );
+		if ( function == null || function.hasParenthesesIfNoArguments() ) {
+			reportSkip( "current_date reuires ()", "tests noarg function that does not require ()" );
+			return;
+		}
+
 		Session s = openSession();
 		Transaction t = s.beginTransaction();
 		EntityWithNoArgFunctionAsColumn e1 = new EntityWithNoArgFunctionAsColumn();
@@ -235,6 +244,13 @@ public void testGetMultiColumnSameNameAsNoArgFunctionHQL() throws Exception {
 	}
 
 	public void testGetMultiColumnSameNameAsNoArgFunctionCriteria() {
+		SQLFunction function =
+				( ( SessionFactoryImplementor ) getSessions() ).getSqlFunctionRegistry().findSQLFunction( "current_date" );
+		if ( function == null || function.hasParenthesesIfNoArguments() ) {
+			reportSkip( "current_date reuires ()", "tests noarg function that does not require ()" );
+			return;
+		}
+
 		Session s = openSession();
 		Transaction t = s.beginTransaction();
 		EntityWithNoArgFunctionAsColumn e1 = new EntityWithNoArgFunctionAsColumn();
@@ -274,6 +290,13 @@ public void testGetMultiColumnSameNameAsNoArgFunctionCriteria() {
 	}
 
 	public void testNoArgFcnAndColumnSameNameAsNoArgFunctionHQL() {
+		SQLFunction function =
+				( ( SessionFactoryImplementor ) getSessions() ).getSqlFunctionRegistry().findSQLFunction( "current_date" );
+		if ( function == null || function.hasParenthesesIfNoArguments() ) {
+			reportSkip( "current_date reuires ()", "tests noarg function that does not require ()" );
+			return;
+		}
+
 		Session s = openSession();
 		Transaction t = s.beginTransaction();
 		EntityWithNoArgFunctionAsColumn e1 = new EntityWithNoArgFunctionAsColumn();

testsuite/src/test/java/org/hibernate/test/hql/FunctionNamesAsColumns.hbm.xml

@@ -9,11 +9,13 @@
             <generator class="increment"/>
         </id>
         <many-to-one name="nextHolder" cascade="all"/>
-        <set name="entityWithArgFunctionAsColumns" inverse="false" lazy="true" cascade="all-delete-orphan">
+        <set name="entityWithArgFunctionAsColumns" inverse="false" lazy="true" cascade="all-delete-orphan"
+             order-by="lower,lower( upper )">
             <key column="HOLDER_ID"/>
             <one-to-many class="EntityWithArgFunctionAsColumn"/>
         </set>
-        <set name="entityWithNoArgFunctionAsColumns" inverse="false" lazy="true" cascade="all-delete-orphan">
+        <set name="entityWithNoArgFunctionAsColumns" inverse="false" lazy="true" cascade="all-delete-orphan"
+                order-by="current_date, `current_date`">
             <key column="HOLDER_ID"/>
             <one-to-many class="EntityWithNoArgFunctionAsColumn"/>
         </set>