Fix wrong result of cast(float as decimal) when overflow happens (#4380)

[ti-chi-bot]

This is an automated cherry-pick of #4380

What problem does this PR solve?

Issue Number: close #3998

Problem Summary:

What is changed and how it works?

When cast float32 to decimal, use Float64 as intermediate type to avoid overflow.

WATCHOUT: there is performance regression and compatibility issue. Explained in the following comments.

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

Fix wrong result of cast(float as decimal) when overflow happens

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• SeaRise
• mengxin9014

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[guo-shaoge]

/run-all-tests

[guo-shaoge]

/merge

[ti-chi-bot]

@guo-shaoge: It seems you want to merge this PR, I will help you trigger all the tests:

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: d8becec

[ti-chi-bot]

@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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