planner: fix incorrect estRows with global index and json column (#55842)

[ti-chi-bot]

This is an automated cherry-pick of #55842

What problem does this PR solve?

Issue Number: close #55818

Problem Summary:

What changed and how does it work?

Because the JSON column will be without stats by default, the row count will be 0. But when calculating selectivity, we cannot divide by zero. it will get NaN row count.

why is the result wrong?

It will return NaN from Selectivity and break all stats info by ds.TableStats.Scale(selectivity)

Final, The problem will be created at the joinReorderGreedySolver.solve-> constructConnectedJoinTree

checkConnectionAndMakeJoin will create a right join plan. but when to calculate the cost, it will get NaN because of the pollute stats info. we cannot get best join because of Nan > math.MaxFloat64. makeBushyJoin will not consider the EqCondtion. Many condition will lose. This is the reason why it will get wrong result.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Due to incorrect statistics, the filter condition was completely removed.

before

+---------------------------+---------+-----------+-----------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| id                        | estRows | task      | access object   | operator info                                                                                                                                                                            |
+---------------------------+---------+-----------+-----------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Projection_12             | NaN     | root      |                 | 1->Column#18                                                                                                                                                                             |
| └─HashJoin_13             | NaN     | root      |                 | CARTESIAN inner join                                                                                                                                                                     |
|   ├─TableReader_19(Build) | 38.00   | root      |                 | data:TableFullScan_18                                                                                                                                                                    |
|   │ └─TableFullScan_18    | 38.00   | cop[tikv] | table:t61a85298 | keep order:false, stats:pseudo                                                                                                                                                           |
|   └─TableReader_17(Probe) | NaN     | root      | partition:all   | data:Selection_16                                                                                                                                                                        |
|     └─Selection_16        | NaN     | cop[tikv] |                 | or(json_memberof(cast(16739493649928310215, json BINARY), test.tceb7972c.col_17), not(istrue_with_null(json_contains(test.tceb7972c.col_17, cast("6019730272580550835", json BINARY))))) |
|       └─TableFullScan_15  | 12.00   | cop[tikv] | table:tceb7972c | keep order:false, stats:partial[col_17:unInitialized]                                                                                                                                    |
+---------------------------+---------+-----------+-----------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

after

id  estRows task  access object operator info
Projection_11 6.00  root    1->Column#18
└─HashJoin_13 6.00  root    inner join, equal:[eq(test.tceb7972c.col_19, Column#19)]
  ├─TableReader_16(Build) 4.80  root  partition:all data:Selection_15
  │ └─Selection_15  4.80  cop[tikv]   or(json_memberof(cast(16739493649928310215, json BINARY), test.tceb7972c.col_17), not(istrue_with_null(json_contains(test.tceb7972c.col_17, cast("6019730272580550835", json BINARY)))))
  │   └─TableFullScan_14  6.00  cop[tikv] table:tceb7972c keep order:false, stats:partial[col_17:missing]
  └─Projection_17(Probe)  10000.00  root    cast(test.t61a85298.col_71, double BINARY)->Column#19
    └─TableReader_19  10000.00  root    data:TableFullScan_18
      └─TableFullScan_18  10000.00  cop[tikv] table:t61a85298 keep order:false, stats:pseudo

• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

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Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #55924   +/-   ##
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  Files                  ?       1466           
  Lines                  ?     423067           
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Components	Coverage Δ
dumpling	52.9656% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.3451% <0.0000%> (?)

[hawkingrei]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, time-and-fate

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-06 14:13:37.382124792 +0000 UTC m=+20087.122548724: ☑️ agreed by hawkingrei.
• 2024-09-09 09:07:43.335838486 +0000 UTC m=+260933.076262461: ☑️ agreed by time-and-fate.

[hawkingrei]

/retest