fix window aggregation with alias and add integration test case

[jimexist]

Which issue does this PR close?

fix window aggregation with alias

Closes #455.

Rationale for this change

What changes are included in this PR?

• fix by rebasing exprs
• add integration test cases

Are there any user-facing changes?

[codecov-commenter]

Codecov Report

Merging #454 (7cb2f1c) into master (c8ab5a4) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #454   +/-   ##
=======================================
  Coverage   75.30%   75.30%           
=======================================
  Files         152      152           
  Lines       25275    25279    +4     
=======================================
+ Hits        19033    19037    +4     
  Misses       6242     6242           

Impacted Files	Coverage Δ
datafusion/src/logical_plan/builder.rs	90.47% <100.00%> (ø)
datafusion/src/sql/planner.rs	84.10% <100.00%> (+0.05%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c8ab5a4...7cb2f1c. Read the comment docs.

[alamb]

I am loving the integration test harness . Thanks @jimexist 👍

[Dandandan]

👍