fix(query): expr children with projectset not fold count

[TCeason]

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

expr children with projectset not fold count

Closes #10826

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
databend	⬜️ Ignored (Inspect)	Visit Preview		Apr 2, 2023 5:07am

[leiysky]

This should be fixed by setting the precise_cardinality to None here:https://github.com/datafuselabs/databend/blob/14e0e4c59d31010f032cd31c5d77b2d2fdd56599/src/query/sql/src/planner/plans/project_set.rs#L51-L61

[TCeason]

https://github.com/datafuselabs/databend/actions/runs/4573208115/jobs/8073531552?pr=10827

Waiting on databend-query 10 seconds...
... connecting to :3307
... connecting to :3307
... connecting to :3307
... connecting to :3307
... connecting to :3307
... connecting to :3307
... connecting to :3307
... connecting to :3307
... connecting to :3307
... connecting to :3307
Traceback (most recent call last):
  File "/runner/_work/databend/databend/scripts/ci/wait_tcp.py", line 38, in <module>
    tcp_ping(args.port, args.timeout)
  File "/runner/_work/databend/databend/scripts/ci/wait_tcp.py", line 26, in tcp_ping
    raise Exception("fail to connect to :{}".format(port))
Exception: fail to connect to :3307
Databend Query

Looks like the ci has some question? I try to re-run it also report this error. cc @BohuTANG

[BohuTANG]

Looks like the ci has some question? I try to re-run it also report this error. cc @BohuTANG

Yes, @everpcpc will help us to address it.

[BohuTANG]

@mergify update

[mergify]

update

✅ Branch has been successfully updated

[BohuTANG]

[Diff] (-expected|+actual)
-   ProjectSet
+   EvalScalar
+   ├── expressions: [get(unnest (#1))]
    ├── estimated rows: 10.00
-   ├── set returning functions: unnest([1, 2, 3])
-   └── TableScan
-       ├── table: default.system.numbers
-       ├── read rows: 10
-       ├── read bytes: 80
-       ├── partitions total: 1
-       ├── partitions scanned: 1
-       ├── push downs: [filters: [], limit: NONE]
-       └── estimated rows: 10.00
+   └── ProjectSet
+       ├── estimated rows: 10.00
+       ├── set returning functions: unnest([1, 2, 3])
+       └── TableScan
+           ├── table: default.system.numbers
+           ├── read rows: 10
+           ├── read bytes: 80
+           ├── partitions total: 1
+           ├── partitions scanned: 1
+           ├── push downs: [filters: [], limit: NONE]
+           └── estimated rows: 10.00
at tests/sqllogictests/suites/mode/standalone/explain/project_set.test:10