[Backport 2.19-dev] Support serializing & deserializing UDTs when pushing down scripts (#4245) #4626
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Description
Backport #4245 to 2.19-dev
Commit Message
Support serializing & deserializing UDTs
Update explain ITs
Push down UDT types as string types for comparison operators
Separate test cases and add an ignored IT
Correct the handling of UDT in CalciteScriptEngine by substituting calcite's type factory with OpenSearchTypeFactory
Fix deserialization for IP
Remove testExplainPushDownScriptsContainingUDT in v2
Enable testLimitAfterAggregation in CalcitePPLAggregationIT
Unit test serialize map and array types
Fix deeper level deserialization of UDTs
Add a yaml test for issue 4322
Add a test case for issue 4340
Remove redundant classes
(cherry picked from commit 69a718b)
Description
[Describe what this change achieves]
Related Issues
Resolves #4063
Check List
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