Add Spark application

spark-sql-application/.gitignore

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+# Compiled output
+target/
+project/target/
+
+# sbt-specific files
+.sbtserver
+.sbt/
+.bsp/
+
+# Miscellaneous
+.DS_Store
+*.class
+*.log
+*.zip

spark-sql-application/README.md

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+# Spark SQL Application
+
+This application execute sql query and store the result in OpenSearch index in following format
+```
+"stepId":"<emr-step-id>",
+"schema": "json blob",
+"result": "json blob"
+```
+
+## Prerequisites
+
++ Spark 3.3.1
++ Scala 2.12.15
++ flint-spark-integration
+
+## Usage
+
+To use this application, you can run Spark with Flint extension:
+
+```
+./bin/spark-submit \
+    --class org.opensearch.sql.SQLJob \
+    --jars <flint-spark-integration-jar> \
+    sql-job.jar \
+    <spark-sql-query> \
+    <opensearch-index> \
+    <opensearch-host> \
+    <opensearch-port> \
+    <opensearch-scheme> \
+    <opensearch-auth> \
+    <opensearch-region> \
+```
+
+## Result Specifications
+
+Following example shows how the result is written to OpenSearch index after query execution.
+
+Let's assume sql query result is
+```
++------+------+
+|Letter|Number|
++------+------+
+|A     |1     |
+|B     |2     |
+|C     |3     |
++------+------+
+```
+OpenSearch index document will look like
+```json
+{
+  "_index" : ".query_execution_result",
+  "_id" : "A2WOsYgBMUoqCqlDJHrn",
+  "_score" : 1.0,
+  "_source" : {
+    "result" : [
+    "{'Letter':'A','Number':1}",
+    "{'Letter':'B','Number':2}",
+    "{'Letter':'C','Number':3}"
+    ],
+    "schema" : [
+      "{'column_name':'Letter','data_type':'string'}",
+      "{'column_name':'Number','data_type':'integer'}"
+    ],
+    "stepId" : "s-JZSB1139WIVU"
+  }
+}
+```
+
+## Build
+
+To build and run this application with Spark, you can run:
+
+```
+sbt clean publishLocal
+```
+
+## Test
+
+To run tests, you can use:
+
+```
+sbt test
+```
+
+## Scalastyle
+
+To check code with scalastyle, you can run:
+
+```
+sbt scalastyle
+```
+
+## Code of Conduct
+
+This project has adopted an [Open Source Code of Conduct](../CODE_OF_CONDUCT.md).
+
+## Security
+
+If you discover a potential security issue in this project we ask that you notify AWS/Amazon Security via our [vulnerability reporting page](http://aws.amazon.com/security/vulnerability-reporting/). Please do **not** create a public GitHub issue.
+
+## License
+
+See the [LICENSE](../LICENSE.txt) file for our project's licensing. We will ask you to confirm the licensing of your contribution.
+
+## Copyright
+
+Copyright OpenSearch Contributors. See [NOTICE](../NOTICE) for details.

spark-sql-application/build.sbt

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+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+name := "sql-job"
+
+version := "1.0"
+
+scalaVersion := "2.12.15"
+
+val sparkVersion = "3.3.2"
+
+mainClass := Some("org.opensearch.sql.SQLJob")
+
+artifactName := { (sv: ScalaVersion, module: ModuleID, artifact: Artifact) =>
+  "sql-job.jar"
+}
+
+resolvers ++= Seq(
+  ("apache-snapshots" at "http://repository.apache.org/snapshots/").withAllowInsecureProtocol(true)
+)
+
+libraryDependencies ++= Seq(
+  "org.apache.spark" %% "spark-core" % sparkVersion % "provided",
+  "org.apache.spark" %% "spark-sql" % sparkVersion % "provided",
+  "org.scalatest" %% "scalatest" % "3.2.15" % Test
+)

spark-sql-application/project/build.properties

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+sbt.version=1.8.2

spark-sql-application/project/plugins.sbt

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+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+ addSbtPlugin("org.scalastyle" %% "scalastyle-sbt-plugin" % "1.0.0")

spark-sql-application/scalastyle-config.xml

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+<scalastyle>
+ <name>Scalastyle standard configuration</name>
+ <check level="warning" class="org.scalastyle.file.FileTabChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.file.FileLengthChecker" enabled="true">
+  <parameters>
+   <parameter name="maxFileLength"><![CDATA[800]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.file.HeaderMatchesChecker" enabled="true">
+  <parameters>
+   <parameter name="header"><![CDATA[/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.SpacesAfterPlusChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.file.WhitespaceEndOfLineChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.scalariform.SpacesBeforePlusChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.file.FileLineLengthChecker" enabled="true">
+  <parameters>
+   <parameter name="maxLineLength"><![CDATA[160]]></parameter>
+   <parameter name="tabSize"><![CDATA[4]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.ClassNamesChecker" enabled="true">
+  <parameters>
+   <parameter name="regex"><![CDATA[[A-Z][A-Za-z]*]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.ObjectNamesChecker" enabled="true">
+  <parameters>
+   <parameter name="regex"><![CDATA[[A-Z][A-Za-z]*]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.PackageObjectNamesChecker" enabled="true">
+  <parameters>
+   <parameter name="regex"><![CDATA[^[a-z][A-Za-z]*$]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.EqualsHashCodeChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.scalariform.IllegalImportsChecker" enabled="true">
+  <parameters>
+   <parameter name="illegalImports"><![CDATA[sun._,java.awt._]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.ParameterNumberChecker" enabled="true">
+  <parameters>
+   <parameter name="maxParameters"><![CDATA[8]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.MagicNumberChecker" enabled="true">
+  <parameters>
+   <parameter name="ignore"><![CDATA[-1,0,1,2,3]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.NoWhitespaceBeforeLeftBracketChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.scalariform.NoWhitespaceAfterLeftBracketChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.scalariform.ReturnChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.scalariform.NullChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.scalariform.NoCloneChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.scalariform.NoFinalizeChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.scalariform.CovariantEqualsChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.scalariform.StructuralTypeChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.file.RegexChecker" enabled="true">
+  <parameters>
+   <parameter name="regex"><![CDATA[println]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.NumberOfTypesChecker" enabled="true">
+  <parameters>
+   <parameter name="maxTypes"><![CDATA[30]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.CyclomaticComplexityChecker" enabled="true">
+  <parameters>
+   <parameter name="maximum"><![CDATA[10]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.UppercaseLChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.scalariform.SimplifyBooleanExpressionChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.scalariform.IfBraceChecker" enabled="true">
+  <parameters>
+   <parameter name="singleLineAllowed"><![CDATA[true]]></parameter>
+   <parameter name="doubleLineAllowed"><![CDATA[false]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.MethodLengthChecker" enabled="true">
+  <parameters>
+   <parameter name="maxLength"><![CDATA[50]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.MethodNamesChecker" enabled="true">
+  <parameters>
+   <parameter name="regex"><![CDATA[^[a-z][A-Za-z0-9]*$]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.NumberOfMethodsInTypeChecker" enabled="true">
+  <parameters>
+   <parameter name="maxMethods"><![CDATA[30]]></parameter>
+  </parameters>
+ </check>
+ <check level="warning" class="org.scalastyle.scalariform.PublicMethodsHaveTypeChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.file.NewLineAtEofChecker" enabled="true"></check>
+ <check level="warning" class="org.scalastyle.file.NoNewLineAtEofChecker" enabled="false"></check>
+</scalastyle>

spark-sql-application/src/main/scala/org/opensearch/sql/SQLJob.scala

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+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.sql
+
+import org.apache.spark.sql.{DataFrame, SparkSession, Row}
+import org.apache.spark.sql.types._
+
+/**
+ * Spark SQL Application entrypoint
+ *
+ * @param args(0)
+ *   sql query
+ * @param args(1)
+ *   opensearch index name
+ * @param args(2-6)
+ *   opensearch connection values required for flint-integration jar. host, port, scheme, auth, region respectively.
+ * @return
+ *   write sql query result to given opensearch index
+ */
+object SQLJob {
+  def main(args: Array[String]) {
+    // Get the SQL query and Opensearch Config from the command line arguments
+    val query = args(0)
+    val index = args(1)
+    val host = args(2)
+    val port = args(3)
+    val scheme = args(4)
+    val auth = args(5)
+    val region = args(6)
+
+    // Create a SparkSession
+    val spark = SparkSession.builder().appName("SQLJob").getOrCreate()
+
+    try {
+      // Execute SQL query
+      val result: DataFrame = spark.sql(query)
+
+      // Get Data
+      val data = getFormattedData(result, spark)
+
+      // Write data to OpenSearch index
+      val aos = Map(
+        "host" -> host,
+        "port" -> port,
+        "scheme" -> scheme,
+        "auth" -> auth,
+        "region" -> region)
+
+      data.write
+        .format("flint")
+        .options(aos)
+        .mode("append")
+        .save(index)
+
+    } finally {
+      // Stop SparkSession
+      spark.stop()
+    }
+  }
+
+  /**
+   * Create a new formatted dataframe with json result, json schema and EMR_STEP_ID.
+   *
+   * @param result
+   *    sql query result dataframe
+   * @param spark
+   *    spark session
+   * @return
+   *    dataframe with result, schema and emr step id
+   */
+  def getFormattedData(result: DataFrame, spark: SparkSession): DataFrame = {
+    // Create the schema dataframe
+    val schemaRows = result.schema.fields.map { field =>
+      Row(field.name, field.dataType.typeName)
+    }
+    val resultSchema = spark.createDataFrame(spark.sparkContext.parallelize(schemaRows), StructType(Seq(
+      StructField("column_name", StringType, nullable = false),
+      StructField("data_type", StringType, nullable = false))))
+
+    // Define the data schema
+    val schema = StructType(Seq(
+      StructField("result", ArrayType(StringType, containsNull = true), nullable = true),
+      StructField("schema", ArrayType(StringType, containsNull = true), nullable = true),
+      StructField("stepId", StringType, nullable = true)))
+
+    // Create the data rows
+    val rows = Seq((
+      result.toJSON.collect.toList.map(_.replaceAll("\"", "'")),
+      resultSchema.toJSON.collect.toList.map(_.replaceAll("\"", "'")),
+      sys.env.getOrElse("EMR_STEP_ID", "")))
+
+    // Create the DataFrame for data
+    spark.createDataFrame(rows).toDF(schema.fields.map(_.name): _*)
+  }
+}