Bug 195970 Two issues when evaluate a query inlcuding a subquery[07]
Description: Currently, when evaluating a query which includes a subquery, the query will be evaluated twice. The binding of query will pass to subquery twice. If user write a java script such as new Date() and i++. The result of query will be incorrect. Another issue: when write the report document, the binding of query will be written twice and the performance is not good to evalulate it twice.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ResultIterator.java
/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getBigDecimal(java.lang.String)
	 */
	public BigDecimal getBigDecimal( String name ) throws BirtException
	{
		return DataTypeUtil.toBigDecimal( getValue( name ) );
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getDate(java.lang.String)
	 */
	public Date getDate( String name ) throws BirtException
	{
		return DataTypeUtil.toDate( getValue( name ) );
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getBlob(java.lang.String)
	 */
	public Blob getBlob( String name ) throws BirtException
	{
		return DataTypeUtil.toBlob( getValue( name ) );
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getBytes(java.lang.String)
	 */
	public byte[] getBytes( String name ) throws BirtException
	{