Nereids doesn't support view based table value function, because tvf view doesn't contain the proper qualifier (catalog, db and table name). This pr is to support this function.
Also, fix nereids table value function explain output exprs incorrect bug.
The sql like
Select count(1) from view
would contain all the columns in old planner's execution plan, which is slow, because BE need to read all the column in data files. This pr is to improve the plan to only contain one column.
A row of complex type may be stored across two(or more) pages, and the parameter `align_rows` indicates that whether the reader should read the remaining value of the last row in previous page.
sort out the test cases of external table.
After modify, there are 2 directories:
1. `external_table_p0`: all p0 cases of external tables: hive, es, jdbc and tvf
2. `external_table_p2`: all p2 cases of external tables: hive, es, mysql, pg, iceberg and tvf
So that we can run it with one line command like:
```
sh run-regression-test.sh --run -d external_table_p0,external_table_p2
```
