fix example bug

[zhoney]

Change-Id: I145e99de88aab45defe6cc00b960d945821edd1e

[codecov]

Codecov Report

Merging #1308 (30e6030) into master (f0d1146) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1308      +/-   ##
============================================
- Coverage     62.11%   62.10%   -0.01%     
  Complexity     5772     5772              
============================================
  Files           377      377              
  Lines         31501    31501              
  Branches       4413     4413              
============================================
- Hits          19566    19565       -1     
  Misses         9946     9946              
- Partials       1989     1990       +1     

Impacted Files	Coverage Δ	Complexity Δ
...a/com/baidu/hugegraph/backend/query/Condition.java	78.38% <0.00%> (-0.37%)	32.00% <0.00%> (ø%)

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