Optimize count const not null

[Lloyd-Pottiger]

What problem does this PR solve?

Issue Number: close #5793, close #5613

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• 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

None

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[Lloyd-Pottiger]

the storage_schema is generated by storage_interpreter, and storage_interpreter is constructed by tidb_table_scan. But the tidb_table_scan come from tidb, which do not support delmark_column, so we can not revise tidb_table_scan, remove the check.

[Lloyd-Pottiger]

/run-all-tests

[ti-chi-bot]

@Lloyd-Pottiger: PR needs rebase.

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