BePPPower opened a new pull request, #10214:
URL: https://github.com/apache/incubator-doris/pull/10214
# Proposed changes
A table-valued function (TVF) is a function that returns a relation or a set
of rows. There are two types of TVFs :
1. a TVF that can be specified in a FROM clause, e.g. range;
2. a TVF that can be specified in SELECT/LATERAL VIEW clauses, e.g. explode.
Here implements the first table valued function framework in this PR. The
frameworks is as follows:
- add TableValuedFunctionRef as a table ref in SQL definition.
- TableValuedFunctionRef will be parsed and analyzed during analysis
process, it will bind to the related TableValuedFunctionInf according to
function name.
- A table valued function will generate a dynamic table and scannode during
plan stage. So that a TableValuedFunctionInf mainly defined two interface:
- public abstract List getTableColumns()
- public abstract List<TableValuedFunctionTask> getTasks();
Developer should also implement the related ScanNode on BE.
## Problem Summary:
In this PR, there is a demo table function numbers. User could use select
sum(number) from numbers("10000"). And we could use this table function to test
our vector engines performance.
MySQL [(none)]> select sum(number) from (select number from numbers("1000")
where number < 10) as c;
+---------------+
| sum(number) |
+---------------+
| 45 |
+---------------+
1 row in set (0.01 sec)
Numbers table function is only supported under vectoried engine.
## Checklist(Required)
1. Does it affect the original behavior: (Yes/No/I Don't know)
2. Has unit tests been added: (Yes/No/No Need)
3. Has document been added or modified: (Yes/No/No Need)
4. Does it need to update dependencies: (Yes/No)
5. Are there any changes that cannot be rolled back: (Yes/No)
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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