Bug 152443 Support boolean type in data set
Support boolean type in data set. It'll cause some data transform issue with absence of boolean type.
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
break;
			case Types.TIMESTAMP :
				fieldClass = Timestamp.class;
				break;
			case Types.BLOB :
				fieldClass = Blob.class;
				break;
			case Types.CLOB :
				fieldClass = Clob.class;
				break;
			case Types.NULL :
				fieldClass = null;
				break;
		}
		return fieldClass;
	}
	/**
	 * Converts an ODI type class to its corresponding 
	 * ODA data type code. <br>
	 * <b>ODI Type Class -> ODA Data Type</b><br>
	 * <i>java.lang.Integer -> Integer<br>
	 * java.lang.Double -> Double<br>
	 * java.lang.String -> Character<br>
	 * java.math.BigDecimal -> Decimal<br>
	 * java.util.Date -> Date<br>
	 * java.sql.Time -> Time<br>
	 * java.sql.Timestamp -> Timestamp<br>
	 * java.sql.Blob -> Blob<br>
	 * java.sql.Clob -> Clob<br></i><br>
	 * All other type classes are mapped to the ODA String data type.