fix: genDDL function will generate incorrect ddl if partition by multi columns

[dl239]

fix #1947

[codecov]

Codecov Report

Merging #1956 (fbbea72) into main (607f32b) will decrease coverage by 0.04%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##               main    #1956      +/-   ##
============================================
- Coverage     75.66%   75.61%   -0.05%     
  Complexity      347      347              
============================================
  Files           613      614       +1     
  Lines        117151   116969     -182     
  Branches       1025     1025              
============================================
- Hits          88643    88450     -193     
- Misses        28299    28310      +11     
  Partials        209      209              

Impacted Files	Coverage Δ
src/sdk/sql_router.cc	3.14% <0.00%> (+0.02%)	⬆️
...s/query_response_time/deploy_query_response_time.h	81.25% <0.00%> (-18.75%)	⬇️
src/log/status.h	70.83% <0.00%> (-12.50%)	⬇️
...atistics/query_response_time/query_response_time.h	78.26% <0.00%> (-4.35%)	⬇️
src/replica/replicate_node.cc	74.30% <0.00%> (-3.92%)	⬇️
src/log/log_reader.cc	76.47% <0.00%> (-3.53%)	⬇️
.../query_response_time/deploy_query_response_time.cc	97.10% <0.00%> (-2.90%)	⬇️
src/nameserver/name_server_impl.cc	42.68% <0.00%> (-0.13%)	⬇️
src/tablet/tablet_impl_test.cc	99.51% <0.00%> (-0.03%)	⬇️
src/storage/mem_table.cc	89.38% <0.00%> (-0.02%)	⬇️
... and 23 more

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[github-actions]

SDK Test Report

  75 files    75 suites   7m 54s ⏱️
163 tests 161 ✔️ 2 💤 0 ❌
204 runs  202 ✔️ 2 💤 0 ❌

Results for commit fbbea72.

[github-actions]

Linux Test Report

       57 files       196 suites   50m 22s ⏱️
  8 941 tests   8 937 ✔️ 4 💤 0 ❌
13 157 runs  13 153 ✔️ 4 💤 0 ❌

Results for commit fbbea72.

[vagetablechicken]

GenDDL part is cryptic, and very little testing. We should refactor and add tests later.