fix: fix create or replace table as select bug

[lichuang]

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

Summary

fix: fix create or replace table as select bug

• Fixes bug: create or replace table does not work after first time #14727

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):

---

This change is 

[drmingdrmer]

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @lichuang)

[sundy-li]

I suggest to use numbers(20), you don't know whether it's replaced or not.