Description

This PR implements Option A: Modular Publishing from the Granularity section of the design. It introduces the ability to publish internal modules (e.g., core, ppl, opensearch) as separate Maven artifacts. This enables downstream consumers such as Spark to depend only on the components they require.

Current naming proposal (subject to feedback):

• Group ID: org.opensearch.query — places all artifacts under a single query/ folder in the Maven repository.
• Artifact ID: unified-query-<module>, e.g., unified-query-core, unified-query-ppl.
• Versioning: Currently follows the OpenSearch version (e.g., 3.1.0.0-SNAPSHOT), but may be decoupled in the future — similar to async-query-core, which uses its own versioning (e.g., 1.0.0).

Local Publishing Test

Example after running the local publish command:

$ ./gradlew publishUnifiedQueryPublicationToMavenLocal

$ pwd
~/.m2/repository/org/opensearch
$ tree .
.
├── plugin  <-- no impact on plugin publishing
│   └── opensearch-sql-plugin
│       └── 3.1.0.0-SNAPSHOT
└── query
    ├── unified-query-common
    │   └── 3.1.0.0-SNAPSHOT
    ├── unified-query-core
    │   └── 3.1.0.0-SNAPSHOT
    ├── unified-query-opensearch
    │   └── 3.1.0.0-SNAPSHOT
    ├── unified-query-ppl
    │   └── 3.1.0.0-SNAPSHOT
    ├── unified-query-protocol
    │   └── 3.1.0.0-SNAPSHOT
    └── unified-query-sql
        └── 3.1.0.0-SNAPSHOT

Spark Integration Test

Verified dependency resolution and query execution using ongoing Calcite 2.19 PR code and local Maven artifacts.

# Checkout Calcite backport draft PR #3752 and patch this PR changes
$ git fetch upstream pull/3752/head:pr-3752
$ git checkout pr-3752

# Build by JDK 11 and publish 2.19 artifacts locally
$ java -version
openjdk version "11.0.25" 2024-10-15 LTS
OpenJDK Runtime Environment Corretto-11.0.25.9.1 (build 11.0.25+9-LTS)
OpenJDK 64-Bit Server VM Corretto-11.0.25.9.1 (build 11.0.25+9-LTS, mixed mode)
$ ./gradlew clean publishUnifiedQueryPublicationToMavenLocal
.
├── plugin
│   └── opensearch-sql-plugin
└── query
    ├── unified-query-common
    │   └── 2.19.3.0-SNAPSHOT
    ├── unified-query-core
    │   └── 2.19.3.0-SNAPSHOT
    ├── unified-query-opensearch
    │   └── 2.19.3.0-SNAPSHOT
    ├── unified-query-ppl
    │   └── 2.19.3.0-SNAPSHOT
    ├── unified-query-protocol
    │   └── 2.19.3.0-SNAPSHOT
    └── unified-query-sql

# Add dependency to Spark: https://github.com/dai-chen/opensearch-spark/tree/verify-unified-ppl-dependency
    resolvers ++= Seq(
      "Local Maven Repository" at "file://" + Path.userHome.absolutePath + "/.m2/repository",
      "OpenSearch Snapshots" at "https://aws.oss.sonatype.org/content/repositories/snapshots/",
      "JitPack" at "https://jitpack.io"
    ),
    libraryDependencies ++= Seq(
      "com.amazonaws" % "aws-java-sdk" % "1.12.397" % "provided"
        exclude ("com.fasterxml.jackson.core", "jackson-databind"),
      ...
      "org.opensearch.query" % "unified-query-ppl" % "2.19.3.0-SNAPSHOT"
        exclude("org.opensearch.query", "unified-query-protocol")
        exclude("org.opensearch.query", "unified-query-opensearch")),

# Run IT with new FlintSparkPPLCalciteParser registered to Spark extension
25/06/11 19:40:10 INFO FlintSparkPPLCalciteParser: 
 PPL => SparkSQL
   PPL query: source = spark_catalog.default.flint_ppl_test | eval f = GET_FORMAT(DATE, 'USA') | fields f
   SQL query: SELECT `GET_FORMAT`('DATE', 'USA') `f`
FROM `spark_catalog`.`default`.`flint_ppl_test`

Related Issues

Resolves part 1 in #3734.

Check List

• New functionality includes testing.
• New functionality has been documented.
• New functionality has javadoc added.
• New functionality has a user manual doc added.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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