ic4y commented on issue #1312:
URL:
https://github.com/apache/arrow-datafusion/issues/1312#issuecomment-969963124
@houqp
Like the following, I added group by for distinct Aggregate, and then
deleted distinct in count. At this time, aggr_expr has changed, but I don’t
want to rewrite the schema, because subsequent Plan Nodes will use this schema
like ProjectionNode
```
Projection: #COUNT(DISTINCT lineorder_flat.lo_orderkey) AS a [a:UInt64;N]
Aggregate: groupBy=[[]], aggr=[[COUNT(DISTINCT
#lineorder_flat.lo_orderkey)]] [COUNT(DISTINCT
lineorder_flat.lo_orderkey):UInt64;N]
TableScan: lineorder_flat projection=Some([0]) [lo_orderkey:Int64;N]
-------------------custom optimizer------------------------------------------
Projection: #COUNT(DISTINCT lineorder_flat.lo_orderkey) AS a [a:UInt64;N]
Aggregate: groupBy=[[]], aggr=[[COUNT(#lineorder_flat.lo_orderkey)]]
[COUNT(DISTINCT lineorder_flat.lo_orderkey):UInt64;N]
Aggregate: groupBy=[[#lineorder_flat.lo_orderkey]], aggr=[[]]
[lo_orderkey:Int64;N]
TableScan: lineorder_flat projection=Some([0]) [lo_orderkey:Int64;N]
```
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