*: Always generate global stats for partitioned tables

[mjonss]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

Always generate global statistics for partitioned tables.

Reverts the PR that falls back on static prune mode if global statistics does not exist.

What is changed and how it works?

Check List

Tests

• [x] Unit test
• [x] Integration test
• [ ] Manual test (add detailed scripts or steps below)
• [ ] No code

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.

Always generate global/table level statistics for partitioned tables, regardless of the tidb_partition_prune_mode setting.

[ti-chi-bot]

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[mjonss]

/run-unit-test

[hawkingrei]

/run-unit-test

[mjonss]

/run-mysql-test tidb-test=pr/1975

[mjonss]

/run-mysql-test tidb-test=pr/1975

[mjonss]

/run-mysql-test tidb-test=pr/1975

[mjonss]

/run-mysql-test tidb-test=pr/1975

[mjonss]

/run-mysql-test tidb-test=pr/1975

[mjonss]

/run-check_dev_2

[mjonss]

/run-mysql-test tidb-test=pr/1975

[ti-chi-bot]

@mjonss: PR needs rebase.

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[ti-chi-bot[bot]]

@mjonss: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/check_dev_2	2109f695d8eed1ad289948f41c21eff7486803bd	link	true	/test check-dev2
idc-jenkins-ci-tidb/mysql-test	2109f695d8eed1ad289948f41c21eff7486803bd	link	true	/test mysql-test
idc-jenkins-ci-tidb/check_dev	2109f695d8eed1ad289948f41c21eff7486803bd	link	true	/test check-dev
idc-jenkins-ci-tidb/build	2109f695d8eed1ad289948f41c21eff7486803bd	link	true	/test build
idc-jenkins-ci-tidb/unit-test	2109f695d8eed1ad289948f41c21eff7486803bd	link	true	/test unit-test
pull-mysql-client-test	2109f695d8eed1ad289948f41c21eff7486803bd	link	true	/test pull-mysql-client-test
pull-integration-ddl-test	2109f695d8eed1ad289948f41c21eff7486803bd	link	true	/test pull-integration-ddl-test
pull-br-integration-test	2109f695d8eed1ad289948f41c21eff7486803bd	link	true	/test pull-br-integration-test
pull-lightning-integration-test	2109f695d8eed1ad289948f41c21eff7486803bd	link	true	/test pull-lightning-integration-test

Full PR test history. Your PR dashboard.

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