From: release/ver-2.0.20.1
To: release/ver-2.0.20.16
FIX BUGS: [TS-357]: NULL column in a row was specially processed [TS-343]: fixed crash bug [TS-144]: fix table missing issue caused by hash rcount overflow
ENHANCEMENTS:
NEW FEATURES:
DOCS:
TEST: [TD-6633]:modify python file