functions: Fix replace not working for const src

[breezewish]

What problem does this PR solve?

Issue Number: close #9522

Problem Summary:

What is changed and how it works?

Fix replace() not working when SRC is a constant

Check List

Tests

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

Fix replace() not working when SRC is a constant

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