Bug 142939 Invalid interval will cause incorrect group action.
Description: Invalid interval will cause incorrect group action. Steps to reproduce: 1. Insert a list 2. Add a group, key is string type column, set interval to year, range to 3 3. Preview Expected result: Error msg about invald interval and ignore the invalid interval. Actual result: No error msg and only return one group with all datarows.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
}
					else
					{
						temporaryComputedColumns.add( new ComputedColumn( groupName,
								expr,
								DataType.INTEGER_TYPE ) );
					}
					
				}
				else
				{
					temporaryComputedColumns.add( new ComputedColumn( groupName,
							expr,
							QueryExecutorUtil.getTempComputedColumnType( groupSpecs[i].getInterval( ) ) ) );
				}
			}
			odiQuery.setGrouping( Arrays.asList( groupSpecs ) );
		}
	}
	/**
	 * @param src
	 * @return
	 */
	private String getGroupKeyExpression( IGroupDefinition src )
	{
		String expr = src.getKeyColumn( );
		if ( expr == null )
		{
			expr = src.getKeyExpression( );
		}