fix: describe distribute table

[MichaelScofield]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

Fix a bug that DESC table is not working correctly for distribute table when primary keys are defined in column options.

Also:

• refactor some error msgs to make them more clear
• unify sqlness test case for creating table

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.

Refer to a related PR or issue link (optional)

close #923

[codecov]

Codecov Report

Merging #988 (3282038) into develop (9ad6c45) will decrease coverage by 0.03%.
The diff coverage is 81.57%.

@@             Coverage Diff             @@
##           develop     #988      +/-   ##
===========================================
- Coverage    85.99%   85.96%   -0.03%     
===========================================
  Files          431      432       +1     
  Lines        61557    62521     +964     
===========================================
+ Hits         52934    53748     +814     
- Misses        8623     8773     +150     

Flag	Coverage Δ
rust	85.96% <81.57%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/frontend/src/expr_factory.rs	91.42% <76.66%> (-4.15%)	⬇️
src/datanode/src/sql/create.rs	91.04% <100.00%> (ø)
src/object-store/src/test_util.rs	0.00% <0.00%> (-100.00%)	⬇️
src/storage/src/compaction/task.rs	7.47% <0.00%> (-59.20%)	⬇️
src/datanode/src/instance.rs	41.56% <0.00%> (-14.91%)	⬇️
src/storage/src/compaction/picker.rs	26.53% <0.00%> (-11.71%)	⬇️
tests-integration/src/test_util.rs	79.47% <0.00%> (-9.33%)	⬇️
src/storage/src/compaction/dedup_deque.rs	75.47% <0.00%> (-7.87%)	⬇️
src/storage/src/read.rs	89.88% <0.00%> (-2.97%)	⬇️
src/servers/src/auth/user_provider.rs	81.81% <0.00%> (-2.28%)	⬇️
... and 42 more

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[waynexia]

Is this bug only occur in a distributed table? Looks like find_primary_keys() also affects other modes.

[MichaelScofield]

find_primary_keys is only called in distributed table creation code path, so this bug only exists in distribute mode. Other comments are resolved, PTAL @waynexia