fix(ast): fix incorrect display for ast (part 1)

[andylokandy]

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Summary

Briefly describe what this PR aims to solve. Include background context that will help reviewers understand the purpose of the PR.

Related #14904

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

[SkyFan2002]

May I ask how can we determine if the SQL generated by Display is equivalent to the original SQL? This has troubled me for a long time.

[andylokandy]

An ideal display will satisfy two rules: 1. The display string contains all information in the original sql, despite of formatting difference; 2. Reparse the displayed string and then display it again should come out with the identical sql.

In this PR, I'll add a check for the second rule.

[SkyFan2002]

An ideal display will satisfy two rules: 1. The display string contains all information in the original sql, despite of formatting difference; 2. Reparse the displayed string and then display it again should come out identical sql.

In this PR, I'll add a check for the second rule.

Thanks. The second rule is brilliant.