Window function bug fix

[avivl]

Fixes #140

[codecov]

Codecov Report

Merging #141 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #141   +/-   ##
=======================================
  Coverage   71.94%   71.94%           
=======================================
  Files           3        3           
  Lines         809      809           
  Branches      184      184           
=======================================
  Hits          582      582           
  Misses        224      224           
  Partials        3        3

Impacted Files	Coverage Δ
src/bigquery_query.ts	87.26% <100%> (ø)	⬆️

---

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 b00ee94...9b123d7. Read the comment docs.