## Proposed changes
Issue Number: close #xxx
add testcases like:
```groovy
qt_notnull1 "select covar_samp(non_nullable(x), non_nullable(y)) from test_covar_samp"
qt_notnull2 "select covar_samp(x, non_nullable(y)) from test_covar_samp"
qt_notnull3 "select covar_samp(non_nullable(x), y) from test_covar_samp"
```
before they will all coredump in 2.1
## Proposed changes
Issue Number: close #xxx
before `corr(nullable_x, nullable_y)` will core dump. not fixed.
no need to patch in master because the refactor
https://github.com/apache/doris/pull/37330 already changed the
implementation context
https://github.com/apache/doris/pull/39251
```
mysql [test11]>select corr(cast(x as float),cast(y as float)) from test_corr;
ERROR 1105 (HY000): errCode = 2, detailMessage = (127.0.0.1)[INTERNAL_ERROR]column_type not match data_types in agg node, column_type=Nullable(Float64), data_types=Nullable(Float32),column name=
```
## Proposed changes
Issue Number: close #xxx
<!--Describe your changes.-->
This pr makes three changes to the display of complex types：
1. NULL value in complex types refers to being displayed as `null`, not `NULL`
2. struct type is displayed as "column_name": column_value
3. Time types such as `datetime` and `date`, are displayed with double quotes in complex types. like
`{1, "2023-10-26 12:12:12"}`
This pr also do a code refactor:
1. nesting_level is set to a member variable of the `DataTypeSerDe`, rather than a parameter in methods.
What's more, this pr fix a bug that fileSize is not correct, introduced by this pr: #25854
Now we can not support streamload with column which is map/array nested map/array
serde can do this now , so we can replace it
Notice. if item data in complex type data is empty we just return error, instead of makeup default value , because now we can not define right default for complex type
