Bug 212505 Use default script ID to skip script debugging
In Dte side, when compile or evaluate java script, it would pass in a script source id. This kind of id is currenlty used by report script debugger. So to skip redundant processing for such kind of internal script evaluating, dte need pass in a default ID, which is defined as ScriptExpression.defaultID. If this id is already used for particular meaning and it can not pass in the default ID, we need define them as public constants and let script debugger check and skip them as well.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/expression/ColumnReferenceExpression.java
return TYPE_DIRECT_COL_REF;
	}
	
	public String getColumnName( )
	{
		return m_columnName;
	}
	public int getColumnindex( )
	{
		return m_columnIndex;
	}
	public boolean isIndexed( )
	{
		return ( m_columnIndex != -1 );
	}
	
	public boolean equals(Object other)
	{
		if ( other == null || ! (other instanceof ColumnReferenceExpression))
			return false;
		
		ColumnReferenceExpression expr2 = (ColumnReferenceExpression) other;
		
		if ( dataType != expr2.dataType )
			return false;
		if ( m_columnName != null )
			return ( m_columnName.equals( expr2.m_columnName)); 
		else 
			return m_columnIndex == expr2.m_columnIndex;
	}