[BUG]While I was using cnosdb, I found a problem with SQL execution failing

[lutengda]

Describe the bug
I tried to execute some SQL using cnosdb.When I execute the following sql, the execution fails, I don't find the syntax error, the error message is sum(...) ... Not a "field name". Here's the sql I executed：
select driver, date_trunc('day',time) as c_date, time, load_capacity, fuel_capacity, sum(case when elevation<50 then elevation else 0 end) over (partition by driver) /sum(elevation) over (partition by driver)/2 from readings where driver in ('Seth','Albert') and time>='2017-01-01T00:00:00' and time<='2017-01-02T00:00:00';
version：4e7cfef
This is the error message about the sql：
422 Unprocessable Entity, details: {\"error_code\":\"010001\",\"error_message\":\"Datafusion: type_coercion\\ncaused by\\nInternal error: Optimizer rule 'type_coercion' failed due to unexpected error: Schema error: No field named 'SUM(CASE WHEN readings.elevation < Int64(50) THEN readings.elevation ELSE Int64(0) END) PARTITION BY [readings.driver] ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING'. Valid fields are 'readings'.'time', 'readings'.'driver', 'readings'.'elevation', 'readings'.'load_capacity', 'readings'.'fuel_capacity', 'SUM(readings.elevation) PARTITION BY [readings.driver] ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING'.. This was likely caused by a bug in DataFusion's code and we would welcome that you file an bug report in our issue tracker\"}

To Reproduce

Expected behavior
The above SQL should execute normally

Additional context

[ZuoTiJia]

It seems that during the expression conversion process, the expression changes and there is no alias, so the projection cannot find the corresponding column name