[Bug Fix] fix a bug in encode/decode in group

[BingqingLyu]

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What do these changes do?

As titled.

Related issue number

Fixes #1965

[codecov-commenter]

Codecov Report

Merging #1966 (3efe79b) into main (2f7d1ec) will decrease coverage by 3.80%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1966      +/-   ##
==========================================
- Coverage   43.91%   40.10%   -3.81%     
==========================================
  Files          89       89              
  Lines        9820     9820              
==========================================
- Hits         4312     3938     -374     
- Misses       5508     5882     +374     

Impacted Files	Coverage Δ
python/graphscope/tests/unittest/test_java_app.py	0.00% <0.00%> (-100.00%)	:arrow_down:
python/graphscope/deploy/hosts/cluster.py	29.41% <0.00%> (-58.83%)	:arrow_down:
python/graphscope/analytical/app/java_app.py	24.24% <0.00%> (-44.95%)	:arrow_down:
python/graphscope/framework/utils.py	40.10% <0.00%> (-14.85%)	:arrow_down:
python/graphscope/framework/app.py	69.95% <0.00%> (-10.33%)	:arrow_down:
python/graphscope/client/rpc.py	81.48% <0.00%> (-8.34%)	:arrow_down:
python/graphscope/framework/graph_schema.py	52.45% <0.00%> (-7.11%)	:arrow_down:
python/graphscope/tests/conftest.py	48.21% <0.00%> (-4.65%)	:arrow_down:
python/graphscope/client/session.py	63.75% <0.00%> (-3.22%)	:arrow_down:
python/graphscope/analytical/udf/utils.py	36.17% <0.00%> (-3.20%)	:arrow_down:
... and 3 more

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