Add larger PyG test

[mewim]

This PR adds a larger-sized PyG test to make sure that the PyG scanning works correctly on a table with 20K rows that is copied with single thread.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (94a611c) 89.82% compared to head (4e25a94) 90.24%.
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2349      +/-   ##
==========================================
+ Coverage   89.82%   90.24%   +0.41%     
==========================================
  Files        1022     1011      -11     
  Lines       35452    32308    -3144     
==========================================
- Hits        31845    29156    -2689     
+ Misses       3607     3152     -455     

see 497 files with indirect coverage changes

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