Bug 201013 [Automation][Regression]Invalid group key column name: _{$TEMP_GROUP_1$} occurs when preview attached report[1102]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
}
		else
		{
			expr = getColumnRefExpression( expr );
		}
		return expr;
	}
	/**
	 * 
	 * @param expr
	 * @return
	 */
	private String getColumnRefExpression( String expr )
	{
		return ExpressionUtil.createJSRowExpression( expr );
	}
	void setParentExecutorHelper( IExecutorHelper helper )
	{
		this.parentHelper = helper;
	}
	/**
	 * 
	 * @param cx
	 * @param dataSetFilters
	 * @param queryFilters
	 * @param temporaryComputedColumns
	 * @return
	 * @throws DataException 
	 */
	private List prepareFilters( Context cx, List dataSetFilters,