feat(query): pretty format for explain

[jiaoew1991]

Signed-off-by: Enwei Jiao enwei.jiao@zilliz.com

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

Summary

support CockroachDB liked explain format

Fixes #5979

[vercel]

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Name	Status	Preview	Updated
databend	✅ Ready (Inspect)	Visit Preview	Jul 13, 2022 at 5:38AM (UTC)

[leiysky]

Rest LGTM.

[BohuTANG]

Hi, there is a test failure:

20_0001_planner_v2:                                                     [ FAIL ] - result differs with:
--- /workspace/tests/suites/0_stateless/20+_others/20_0001_planner_v2.result	2022-07-13 02:18:12.545147220 +0000
+++ /workspace/tests/suites/0_stateless/20+_others/20_0001_planner_v2.stdout	2022-07-13 02:23:42.577675575 +0000
@@ -323,15 +323,15 @@
 9
 ===Explain===
 Project: [a]
-    Filter: [t1.a > 0]
-        Scan: default.default.t1
+└── Filter: [t1.a > 0]
+    └── Scan: default.default.t1
 Filter: [(t1.a > 3) OR ((t2.a > 5) AND (t1.a > 1))]
-    HashJoin: INNER, build keys: [t2.a], probe keys: [t1.a], join filters: []
-        Scan: default.default.t1
-        Scan: default.default.t2
+└── HashJoin: INNER, build keys: [t2.a], probe keys: [t1.a], join filters: []
+    ├── Scan: default.default.t1
+    └── Scan: default.default.t2
 HashJoin: INNER, build keys: [t2.a], probe keys: [t1.a], join filters: []
-    Scan: default.default.t1
-    Scan: default.default.t2
+├── Scan: default.default.t1
+└── Scan: default.default.t2
 ===Explain Pipeline===
 Project × 1 processor
   TransformHashJoin × 1 processor

https://github.com/datafuselabs/databend/runs/7313362524?check_suite_focus=true#step:3:464

[Xuanwo]

Clippy is not happy:

--> query/src/sql/planner/format/pretty_format.rs:53:61
|
53|                (child_prefix.clone() + LAST_REGULAR_PREFIX).clone(),
| ^^^^^^^^help: remove this
|
= note: `-D clippy::redundant-clone` implied by `-D warnings`
note: this value is dropped without further use
--> query/src/sql/planner/format/pretty_format.rs:53:17
|
53|                (child_prefix.clone() + LAST_REGULAR_PREFIX).clone(),
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_clone
error: redundant clone
--> query/src/sql/planner/format/pretty_format.rs:54:51
|
54|                (child_prefix + LAST_CHILD_PREFIX).clone(),
| ^^^^^^^^help: remove this
|
note: this value is dropped without further use
--> query/src/sql/planner/format/pretty_format.rs:54:17
|
54|                (child_prefix + LAST_CHILD_PREFIX).clone(),
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_clone

[Xuanwo]

@mergify update

[Xuanwo]

cc @leiysky PTAL

[mergify]

update

✅ Branch has been successfully updated

[BohuTANG]

Thanks for the contribution.