Support JOIN query on object field with unexpanded name

[dai-chen]

Signed-off-by: Chen Dai daichen@amazon.com

Description

This PR is to fix JOIN query on object field which has unexpanded name. This is very common and convenient for user to create object field deep nested. Please check my comments in issue: #1135 (comment). In short, OpenSearch gives different response format, "account.name.first": "John" rather than "account": {"name": {"first": "John"}}}, if the doc was created in this way:

PUT join-object-test/_doc/1
{ 
  "account.name.first": "John"
}

POST localhost:9200/join-object-test/_search
{
  "took": 2,
   ...
    "hits": [
      {
        "_index": "join-object-test",
        "_id": "Ac00gIUBc6yO9RmmMeTE",
        "_score": 1.0,
        "_source": {
          "account.name.first": "John"
        }
      }
    ]
  }
}

TODO

This PR is a quick fix for upcoming 2.5.0 release. Afterwards, we need to check if V2 engine has same problem and fix it. We may want to document the limitation if complicated cases like #1135 (comment) is hard to support finally.

Issues Resolved

#1135

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

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[codecov-commenter]

Codecov Report

Merging #1229 (6cb5f25) into main (1b58f7d) will decrease coverage by 2.45%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1229      +/-   ##
============================================
- Coverage     98.32%   95.86%   -2.46%     
- Complexity     3550     3575      +25     
============================================
  Files           344      354      +10     
  Lines          8762     9477     +715     
  Branches        554      678     +124     
============================================
+ Hits           8615     9085     +470     
- Misses          142      334     +192     
- Partials          5       58      +53     

Flag	Coverage Δ
query-workbench	62.76% <ø> (?)
sql-engine	98.33% <ø> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
...n/java/org/opensearch/sql/utils/DateTimeUtils.java	100.00% <0.00%> (ø)
...a/org/opensearch/sql/data/model/ExprDateValue.java	100.00% <0.00%> (ø)
...a/org/opensearch/sql/data/model/ExprTimeValue.java	100.00% <0.00%> (ø)
.../org/opensearch/sql/data/model/ExprValueUtils.java	100.00% <0.00%> (ø)
...g/opensearch/sql/data/model/ExprDatetimeValue.java	100.00% <0.00%> (ø)
...pensearch/sql/expression/function/FunctionDSL.java	100.00% <0.00%> (ø)
...arch/sql/expression/datetime/DateTimeFunction.java	100.00% <0.00%> (ø)
...h/sql/expression/function/BuiltinFunctionName.java	100.00% <0.00%> (ø)
...h/public/components/QueryLanguageSwitch/Switch.tsx	85.71% <0.00%> (ø)
workbench/public/components/SQLPage/SQLPage.tsx	100.00% <0.00%> (ø)
... and 8 more

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