[Backport 2.19-dev] Implement Append
command with Calcite (#4123)
#4244
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Implement Append Command
Fix spotless check
Rephrase append.rst
Support subsearch different index for append command
Fix some tests and add cross cluster IT
Not support empty subsearch input for now
Fix doctest
Support empty source edge case
Fix anonymizer tests
Add missing test cases for nested join or lookup command in appended subsearch
Fix compile issue
Description
Manual backport #4123 into 2.19-dev
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