HHH-8136 Correct "to_char" function in HSQL

Author: brmeyer

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

@@ -142,7 +142,7 @@ public HSQLDialect() {
 		registerFunction( "reverse", new StandardSQLFunction( "reverse" ) );
 		registerFunction( "space", new StandardSQLFunction( "space", StandardBasicTypes.STRING ) );
 		registerFunction( "str", new SQLFunctionTemplate( StandardBasicTypes.STRING, "cast(?1 as varchar(256))" ) );
-		registerFunction( "to_char", new StandardSQLFunction( "to_char" ) );
+		registerFunction( "to_char", new StandardSQLFunction( "to_char", StandardBasicTypes.STRING ) );
 		registerFunction( "rawtohex", new StandardSQLFunction( "rawtohex" ) );
 		registerFunction( "hextoraw", new StandardSQLFunction( "hextoraw" ) );