fix: add checking if there is data in the base table for long window deploy

[zhanghaohit]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Fix #2483

• add checking if there is data in the base table for long window deployment
• add checking in LogReader for offset

• What is the current behavior? (You can also link to an open issue here)

• What is the new behavior (if this is a feature change)?

[codecov]

Codecov Report

Base: 75.78% // Head: 75.80% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (d89d315) compared to base (9506905).
Patch coverage: 87.09% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2501      +/-   ##
============================================
+ Coverage     75.78%   75.80%   +0.01%     
  Complexity      371      371              
============================================
  Files           638      638              
  Lines        120380   120453      +73     
  Branches       1051     1051              
============================================
+ Hits          91235    91309      +74     
+ Misses        28928    28927       -1     
  Partials        217      217              

Impacted Files	Coverage Δ
src/sdk/sql_cluster_router.cc	57.38% <45.00%> (+0.09%)	⬆️
src/base/ddl_parser.cc	74.78% <50.00%> (ø)
src/storage/aggregator.cc	77.80% <70.00%> (-1.01%)	⬇️
src/replica/log_replicator_test.cc	94.21% <97.91%> (+0.37%)	⬆️
src/cmd/sql_cmd_test.cc	99.00% <100.00%> (+<0.01%)	⬆️
src/log/log_reader.cc	79.77% <100.00%> (+3.30%)	⬆️
src/log/log_reader.h	100.00% <100.00%> (ø)
src/tablet/tablet_impl_test.cc	99.54% <100.00%> (+<0.01%)	⬆️
src/storage/disk_table_snapshot.cc	56.71% <0.00%> (-4.48%)	⬇️
src/rpc/rpc_client.h	85.13% <0.00%> (-4.06%)	⬇️
... and 19 more

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[github-actions]

Linux Test Report

       55 files       203 suites   1h 6m 50s ⏱️
  9 907 tests   9 900 ✔️ 7 💤 0 ❌
14 583 runs  14 576 ✔️ 7 💤 0 ❌

Results for commit d89d315.

♻️ This comment has been updated with latest results.

[github-actions]

SDK Test Report

  81 files    81 suites   7m 4s ⏱️
168 tests 166 ✔️ 2 💤 0 ❌
210 runs  208 ✔️ 2 💤 0 ❌

Results for commit d89d315.

♻️ This comment has been updated with latest results.