Fix issue-1673

[andyfengHKU]

Fix issue #1673

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (bfacd23) 91.09% compared to head (a6f90ae) 91.09%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1790   +/-   ##
=======================================
  Coverage   91.09%   91.09%           
=======================================
  Files         774      774           
  Lines       28322    28323    +1     
=======================================
+ Hits        25799    25801    +2     
+ Misses       2523     2522    -1     

Impacted Files	Coverage Δ
src/include/processor/operator/mask.h	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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