fix: handling scalar subquery in function

[reata]

Closes #614

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.54%. Comparing base (4c30955) to head (233be5d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #617   +/-   ##
=======================================
  Coverage   99.54%   99.54%           
=======================================
  Files          41       41           
  Lines        2197     2216   +19     
=======================================
+ Hits         2187     2206   +19     
  Misses         10       10           

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