expression: handle Float32 for builtin function Values()

[zz-jason]

Signed-off-by: Jian Zhang [email protected]

What problem does this PR solve?

fix #8934

What is changed and how it works?

The builtin function Values() should get a floag32 value from the input Chunk when it's output type is mysql.TypeFloat.

Only Column and builtinValuesRealSig call Chunk.GetFloat64(). Column has handled the float32 input value correctly.

Check List

Tests

• Unit test

Related changes

• Need to cherry-pick to the release branch

[zz-jason]

/run-all-tests

[codecov-io]

Codecov Report

Merging #9215 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #9215      +/-   ##
==========================================
- Coverage   67.22%   67.21%   -0.01%     
==========================================
  Files         371      371              
  Lines       77050    77052       +2     
==========================================
- Hits        51800    51794       -6     
- Misses      20625    20631       +6     
- Partials     4625     4627       +2

Impacted Files	Coverage Δ
expression/builtin_other.go	65.36% <100%> (+0.16%)	⬆️
ddl/delete_range.go	75.13% <0%> (-4.24%)	⬇️
store/tikv/scan.go	73.94% <0%> (-3.37%)	⬇️
executor/join.go	78.9% <0%> (+1.04%)	⬆️

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[XuHuaiyu]

LGTM

[eurekaka]

LGTM