[Backport 0.5-nexus] Add langType to FlintStatement model

flint-commons/src/main/scala/org/opensearch/flint/common/model/FlintStatement.scala

@@ -31,6 +31,8 @@ object StatementStates {
  *   Unique identifier for the type of statement.
  * @param queryId
  *   Unique identifier for the query.
+ * @param langType
+ *   The language type of the query (e.g., "sql" or "ppl").
  * @param submitTime
  *   Timestamp when the statement was submitted.
  * @param error
@@ -44,6 +46,7 @@ class FlintStatement(
     // statementId is the statement type doc id
     val statementId: String,
     val queryId: String,
+    val langType: String,
     val submitTime: Long,
     var error: Option[String] = None,
     statementContext: Map[String, Any] = Map.empty[String, Any])
@@ -65,7 +68,7 @@ class FlintStatement(
 
   // Does not include context, which could contain sensitive information.
   override def toString: String =
-    s"FlintStatement(state=$state, statementId=$statementId, queryId=$queryId, submitTime=$submitTime, error=$error)"
+    s"FlintStatement(state=$state, statementId=$statementId, queryId=$queryId, langType=$langType, submitTime=$submitTime, error=$error)"
 }
 
 object FlintStatement {
@@ -78,13 +81,14 @@ object FlintStatement {
     val query = (meta \ "query").extract[String]
     val statementId = (meta \ "statementId").extract[String]
     val queryId = (meta \ "queryId").extract[String]
+    val langType = (meta \ "lang").extract[String].toLowerCase(Locale.ROOT)
     val submitTime = (meta \ "submitTime").extract[Long]
     val maybeError: Option[String] = (meta \ "error") match {
       case JString(str) => Some(str)
       case _ => None
     }
 
-    new FlintStatement(state, query, statementId, queryId, submitTime, maybeError)
+    new FlintStatement(state, query, statementId, queryId, langType, submitTime, maybeError)
   }
 
   def serialize(flintStatement: FlintStatement): String = {

flint-commons/src/main/scala/org/opensearch/flint/common/model/LangType.scala

@@ -0,0 +1,25 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.flint.common.scheduler.model
+
+object LangType {
+  val SQL = "sql"
+  val PPL = "ppl"
+
+  private val values = Seq(SQL, PPL)
+
+  /**
+   * Get LangType from text.
+   *
+   * @param text
+   *   input text
+   * @return
+   *   Option[String] if found, None otherwise
+   */
+  def fromString(text: String): Option[String] = {
+    values.find(_.equalsIgnoreCase(text))
+  }
+}

integ-test/src/integration/scala/org/apache/spark/sql/FlintREPLITSuite.scala

@@ -210,6 +210,7 @@ class FlintREPLITSuite extends SparkFunSuite with OpenSearchSuite with JobTest {
          |  "state": "waiting",
          |  "submitTime": $submitTime,
          |  "type": "statement",
+         |  "lang": "sql",
          |  "statementId": "${statementId}",
          |  "queryId": "${queryId}",
          |  "dataSourceName": "${dataSourceName}"

spark-sql-application/src/main/scala/org/apache/spark/sql/JobOperator.scala

@@ -13,6 +13,7 @@ import scala.concurrent.duration.{Duration, MINUTES}
 import scala.util.{Failure, Success, Try}
 
 import org.opensearch.flint.common.model.FlintStatement
+import org.opensearch.flint.common.scheduler.model.LangType
 import org.opensearch.flint.core.metrics.MetricConstants
 import org.opensearch.flint.core.metrics.MetricsUtil.incrementCounter
 import org.opensearch.flint.spark.FlintSpark
@@ -71,7 +72,13 @@ case class JobOperator(
       instantiateStatementExecutionManager(commandContext, resultIndex, osClient)
 
     val statement =
-      new FlintStatement("running", query, "", queryId, currentTimeProvider.currentEpochMillis())
+      new FlintStatement(
+        "running",
+        query,
+        "",
+        queryId,
+        LangType.SQL,
+        currentTimeProvider.currentEpochMillis())
 
     var exceptionThrown = true
     var error: String = null

spark-sql-application/src/test/scala/org/apache/spark/sql/FlintREPLTest.scala

@@ -23,6 +23,7 @@ import org.mockito.invocation.InvocationOnMock
 import org.mockito.stubbing.Answer
 import org.opensearch.action.get.GetResponse
 import org.opensearch.flint.common.model.{FlintStatement, InteractiveSession, SessionStates}
+import org.opensearch.flint.common.scheduler.model.LangType
 import org.opensearch.flint.core.storage.{FlintReader, OpenSearchReader, OpenSearchUpdater}
 import org.opensearch.search.sort.SortOrder
 import org.scalatest.prop.TableDrivenPropertyChecks._
@@ -269,7 +270,8 @@ class FlintREPLTest
     val expected =
       spark.createDataFrame(spark.sparkContext.parallelize(expectedRows), expectedSchema)
 
-    val flintStatement = new FlintStatement("failed", "select 1", "30", "10", currentTime, None)
+    val flintStatement =
+      new FlintStatement("failed", "select 1", "30", "10", LangType.SQL, currentTime, None)
 
     try {
       FlintREPL.currentTimeProvider = new MockTimeProvider(currentTime)
@@ -711,7 +713,14 @@ class FlintREPLTest
       val startTime = System.currentTimeMillis()
       val expectedDataFrame = mock[DataFrame]
       val flintStatement =
-        new FlintStatement("running", "select 1", "30", "10", Instant.now().toEpochMilli(), None)
+        new FlintStatement(
+          "running",
+          "select 1",
+          "30",
+          "10",
+          LangType.SQL,
+          Instant.now().toEpochMilli(),
+          None)
       // When the `sql` method is called, execute the custom Answer that introduces a delay
       when(mockSparkSession.sql(any[String])).thenAnswer(new Answer[DataFrame] {
         override def answer(invocation: InvocationOnMock): DataFrame = {
@@ -782,6 +791,7 @@ class FlintREPLTest
         "select * from default.http_logs limit1 1",
         "10",
         "20",
+        LangType.SQL,
         Instant.now().toEpochMilli,
         None)
     val threadPool = ThreadUtils.newDaemonThreadPoolScheduledExecutor("flint-repl", 1)
@@ -1325,6 +1335,7 @@ class FlintREPLTest
           "query": "SELECT * FROM table",
           "statementId": "stmt123",
           "queryId": "query456",
+          "lang": "sql",
           "submitTime": 1234567890,
           "error": "Some error"
         }