Add The TO_SECONDS Function To The SQL Plugin

[GabeFernandez310]

Description

Adds the to_seconds function to the SQL plugin. Takes a DATE/TIME/DATETIME/TIMESTAMP/STRING/INTEGER representing a point in time, and converts it to seconds since the year 0. This function is based off of MySQL. For arguments of type TIME, the function takes the current date at the given time. For INTEGER, the integer is parsed as a date (e.g. 950501 == 1995-05-01).

Examples:
SELECT TO_SECONDS(950501); -> 62966505600
SELECT TO_SECONDS('2009-11-29'); -> 63426672000
SELECT TO_SECONDS('2009-11-29 13:43:32'); -> 63426721412

Issues Resolved

#722

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #1419 (b366b76) into main (cd95bc5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

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@@            Coverage Diff            @@
##               main    #1419   +/-   ##
=========================================
  Coverage     98.38%   98.39%           
- Complexity     3693     3711   +18     
=========================================
  Files           343      343           
  Lines          9107     9162   +55     
  Branches        585      588    +3     
=========================================
+ Hits           8960     9015   +55     
  Misses          142      142           
  Partials          5        5           

Flag	Coverage Δ
sql-engine	98.39% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...c/main/java/org/opensearch/sql/expression/DSL.java	100.00% <100.00%> (ø)
...arch/sql/expression/datetime/DateTimeFunction.java	100.00% <100.00%> (ø)
...h/sql/expression/function/BuiltinFunctionName.java	100.00% <100.00%> (ø)
...a/org/opensearch/sql/utils/DateTimeFormatters.java	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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[acarbonetto]

LGTM

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-1419-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 d38a6ec20d1ddc035adf53f610af05cfad812b6a
# Push it to GitHub
git push --set-upstream origin backport/backport-1419-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-1419-to-2.x.