fix: define the ordering for rows having same key/ts in window union but from different datasource

[aceforeverd]

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

close #1776

• 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)?

[github-actions]

SDK Test Report

  74 files    74 suites   5m 29s ⏱️
175 tests 172 ✔️ 3 💤 0 ❌
216 runs  213 ✔️ 3 💤 0 ❌

Results for commit 2d6f557.

♻️ This comment has been updated with latest results.

[github-actions]

Linux Test Report

       57 files       186 suites   1h 6m 55s ⏱️
  8 542 tests   8 534 ✔️ 8 💤 0 ❌
12 528 runs  12 520 ✔️ 8 💤 0 ❌

Results for commit 2d6f557.

♻️ This comment has been updated with latest results.

[github-actions]

HybridSE Linux Test Report

       67 files       235 suites   6m 13s ⏱️
19 059 tests 19 057 ✔️ 2 💤 0 ❌

Results for commit 2d6f557.

♻️ This comment has been updated with latest results.

[github-actions]

HybridSE Mac Test Report

       67 files       235 suites   6m 12s ⏱️
19 059 tests 19 057 ✔️ 2 💤 0 ❌

Results for commit 2d6f557.

♻️ This comment has been updated with latest results.

[tobegit3hub]

LGTM

[codecov]

Codecov Report

Merging #1802 (2d6f557) into main (361f44d) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #1802      +/-   ##
============================================
+ Coverage     73.64%   73.75%   +0.10%     
  Complexity      347      347              
============================================
  Files           614      614              
  Lines        120131   120314     +183     
  Branches       1015     1015              
============================================
+ Hits          88475    88742     +267     
+ Misses        31447    31363      -84     
  Partials        209      209              

Impacted Files	Coverage Δ
hybridse/src/vm/runner.h	92.84% <ø> (ø)
hybridse/src/vm/runner.cc	67.81% <100.00%> (-0.07%)	⬇️
hybridse/src/codec/type_codec.cc	74.40% <0.00%> (-0.60%)	⬇️
src/sdk/db_sdk.cc	62.58% <0.00%> (-0.46%)	⬇️
src/catalog/client_manager.cc	42.20% <0.00%> (-0.29%)	⬇️
src/nameserver/name_server_create_remote_test.cc	98.70% <0.00%> (-0.19%)	⬇️
src/storage/mem_table.cc	89.13% <0.00%> (-0.14%)	⬇️
src/cmd/sql_cmd_test.cc	99.55% <0.00%> (-0.04%)	⬇️
src/nameserver/standalone_test.cc	100.00% <0.00%> (ø)
src/nameserver/name_server_test.cc	92.29% <0.00%> (ø)
... and 19 more

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[aceforeverd]

Bugs (Normal)