Bug 124761 When add two filters, one is 'State is equal to CA' and the other is 'EmployeeId is Top 10',the data can be extracted.
Description: When add two filters, one is 'State is equal to CA' and the other is 'EmployeeId is Top 10',the data can not be extracted. Steps to reproduce: 1. import the attached report 2. preview Actual result: the data can not be extracted. Expect result: The intersection set of the data 'State is equal to CA' and the data 'EmployeeId is Top 10' should be displayed.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/odi/IQuery.java
* Instantiates a groupSpec defining a column name
    	 * as its required group key.
    	 * @param groupKeyColumn The column name as the group key.
    	 */
        public GroupSpec( int groupKeyIndex, String groupKeyColumn )
		{
			keyIndex = groupKeyIndex;
			keyColumn = groupKeyColumn;
		}
        
    	/**
		 * Gets the index of the column that defines the group key.
		 * 
		 * @return The column name of the group key.
		 */
		public int getKeyIndex( )
		{
			return keyIndex;
		}
    	
    	/**
		 * Gets the name of the column that defines the group key.
		 * 
		 * @return The column name of the group key.
		 */
    	public String getKeyColumn( )
    	{
    		return keyColumn;
    	}