Support complex size filtering and restriction statements for position or other similar values

[jack9603301]

It is recommended to implement complex size filtering and restriction statements for position or other similar values, which will greatly increase the query capability of BQL. Although we can accurately distinguish the income and expenditure according to the standard classification of account, it is very difficult to restrict the query on position value for some specific needs. I don't know how to do it. If it can be supported, it would be great.