fix(frontend): fix window_start type

[TennyZhuang]

Signed-off-by: TennyZhuang [email protected]

What's changed and what's your intention?

PLEASE DO NOT LEAVE THIS EMPTY !!!

1. fix the return type of tumble_start_date.
2. fix the type in binder and planner.

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests

Refer to a related PR or issue link (optional)

Close #1600

[codecov]

Codecov Report

Merging #1601 (0b2611d) into main (1e321f1) will increase coverage by 0.00%.
The diff coverage is 64.70%.

@@            Coverage Diff            @@
##               main    #1601   +/-   ##
=========================================
  Coverage     69.89%   69.90%           
  Complexity     2766     2766           
=========================================
  Files          1041     1041           
  Lines         91744    91734   -10     
  Branches       1790     1790           
=========================================
+ Hits          64122    64123    +1     
+ Misses        26731    26720   -11     
  Partials        891      891           

Flag	Coverage Δ
java	61.01% <ø> (ø)
rust	71.75% <64.70%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/expr/src/expr/expr_binary_nonnull.rs	77.73% <0.00%> (ø)
src/expr/src/vector_op/tumble.rs	78.04% <0.00%> (+14.04%)	⬆️
src/frontend/src/binder/window_table_function.rs	68.60% <100.00%> (-2.05%)	⬇️
src/frontend/src/expr/type_inference.rs	93.48% <100.00%> (+0.12%)	⬆️
src/frontend/src/planner/relation.rs	89.87% <100.00%> (-0.26%)	⬇️
src/common/src/types/ordered_float.rs	23.70% <0.00%> (+0.19%)	⬆️
src/connector/src/filesystem/file_common.rs	81.16% <0.00%> (+0.44%)	⬆️

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[xiangjinwu]

lgtm