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#getBoolean(java.lang.String)
	 */
	public Boolean getBoolean( String name ) throws BirtException
	{
		return DataTypeUtil.toBoolean( getValue( name ) );
	}
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getInteger(java.lang.String)
	 */
	public Integer getInteger( String name ) throws BirtException
	{
		return DataTypeUtil.toInteger( getValue( name ) );
	}
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getDouble(java.lang.String)
	 */
	public Double getDouble( String name ) throws BirtException
	{
		return DataTypeUtil.toDouble( getValue( name ) );
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getString(java.lang.String)
	 */
	public String getString( String name ) throws BirtException
	{
		return DataTypeUtil.toString( getValue( name ) );
	}