Merge branch 'main' into ppl-spark-translation

flint-core/src/main/scala/org/opensearch/flint/core/FlintClient.java

@@ -5,12 +5,11 @@
 
 package org.opensearch.flint.core;
 
+import java.util.List;
 import org.opensearch.flint.core.metadata.FlintMetadata;
 import org.opensearch.flint.core.storage.FlintReader;
 import org.opensearch.flint.core.storage.FlintWriter;
 
-import java.io.Writer;
-
 /**
  * Flint index client that provides API for metadata and data operations
  * on a Flint index regardless of concrete storage.
@@ -33,6 +32,14 @@ public interface FlintClient {
    */
   boolean exists(String indexName);
 
+  /**
+   * Retrieve all metadata for Flint index whose name matches the given pattern.
+   *
+   * @param indexNamePattern index name pattern
+   * @return all matched index metadata
+   */
+  List<FlintMetadata> getAllIndexMetadata(String indexNamePattern);
+
   /**
    * Retrieve metadata in a Flint index.
    *

flint-core/src/main/scala/org/opensearch/flint/core/storage/FlintOpenSearchClient.java

@@ -5,9 +5,17 @@
 
 package org.opensearch.flint.core.storage;
 
+import static org.opensearch.common.xcontent.DeprecationHandler.IGNORE_DEPRECATIONS;
+
 import com.amazonaws.auth.AWS4Signer;
 import com.amazonaws.auth.AWSCredentialsProvider;
 import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.stream.Collectors;
 import org.apache.http.HttpHost;
 import org.opensearch.action.admin.indices.delete.DeleteIndexRequest;
 import org.opensearch.client.RequestOptions;
@@ -34,13 +42,6 @@
 import org.opensearch.search.SearchModule;
 import org.opensearch.search.builder.SearchSourceBuilder;
 
-import java.io.IOException;
-import java.lang.reflect.Constructor;
-import java.util.ArrayList;
-import java.util.concurrent.atomic.AtomicReference;
-
-import static org.opensearch.common.xcontent.DeprecationHandler.IGNORE_DEPRECATIONS;
-
 /**
  * Flint client implementation for OpenSearch storage.
  */
@@ -79,6 +80,19 @@ public FlintOpenSearchClient(FlintOptions options) {
     }
   }
 
+  @Override public List<FlintMetadata> getAllIndexMetadata(String indexNamePattern) {
+    try (RestHighLevelClient client = createClient()) {
+      GetMappingsRequest request = new GetMappingsRequest().indices(indexNamePattern);
+      GetMappingsResponse response = client.indices().getMapping(request, RequestOptions.DEFAULT);
+
+      return response.mappings().values().stream()
+          .map(mapping -> new FlintMetadata(mapping.source().string()))
+          .collect(Collectors.toList());
+    } catch (Exception e) {
+      throw new IllegalStateException("Failed to get Flint index metadata for " + indexNamePattern, e);
+    }
+  }
+
   @Override public FlintMetadata getIndexMetadata(String indexName) {
     try (RestHighLevelClient client = createClient()) {
       GetMappingsRequest request = new GetMappingsRequest().indices(indexName);

flint-spark-integration/src/main/antlr4/FlintSparkSqlExtensions.g4

@@ -47,6 +47,8 @@ dropSkippingIndexStatement
 coveringIndexStatement
     : createCoveringIndexStatement
     | refreshCoveringIndexStatement
+    | showCoveringIndexStatement
+    | describeCoveringIndexStatement
     | dropCoveringIndexStatement
     ;
 
@@ -60,6 +62,14 @@ refreshCoveringIndexStatement
     : REFRESH INDEX indexName=identifier ON tableName=multipartIdentifier
     ;
 
+showCoveringIndexStatement
+    : SHOW (INDEX | INDEXES) ON tableName=multipartIdentifier
+    ;
+
+describeCoveringIndexStatement
+    : (DESC | DESCRIBE) INDEX indexName=identifier ON tableName=multipartIdentifier
+    ;
+
 dropCoveringIndexStatement
     : DROP INDEX indexName=identifier ON tableName=multipartIdentifier
     ;

flint-spark-integration/src/main/antlr4/SparkSqlBase.g4

@@ -160,9 +160,11 @@ DESCRIBE: 'DESCRIBE';
 DROP: 'DROP';
 FALSE: 'FALSE';
 INDEX: 'INDEX';
+INDEXES: 'INDEXES';
 ON: 'ON';
 PARTITION: 'PARTITION';
 REFRESH: 'REFRESH';
+SHOW: 'SHOW';
 STRING: 'STRING';
 TRUE: 'TRUE';
 WITH: 'WITH';

flint-spark-integration/src/main/scala/org/opensearch/flint/spark/FlintSpark.scala

@@ -136,6 +136,18 @@ class FlintSpark(val spark: SparkSession) {
     }
   }
 
+  /**
+   * Describe all Flint indexes whose name matches the given pattern.
+   *
+   * @param indexNamePattern
+   *   index name pattern which may contains wildcard
+   * @return
+   *   Flint index list
+   */
+  def describeIndexes(indexNamePattern: String): Seq[FlintSparkIndex] = {
+    flintClient.getAllIndexMetadata(indexNamePattern).asScala.map(deserialize)
+  }
+
   /**
    * Describe a Flint index.
    *

flint-spark-integration/src/main/scala/org/opensearch/flint/spark/covering/FlintSparkCoveringIndex.scala

@@ -28,7 +28,7 @@ import org.apache.spark.sql.types.StructType
  * @param indexedColumns
  *   indexed column list
  */
-class FlintSparkCoveringIndex(
+case class FlintSparkCoveringIndex(
     indexName: String,
     tableName: String,
     indexedColumns: Map[String, String])

flint-spark-integration/src/main/scala/org/opensearch/flint/spark/sql/covering/FlintSparkCoveringIndexAstBuilder.scala

@@ -11,9 +11,12 @@ import org.opensearch.flint.spark.FlintSpark.RefreshMode
 import org.opensearch.flint.spark.covering.FlintSparkCoveringIndex
 import org.opensearch.flint.spark.sql.{FlintSparkSqlCommand, FlintSparkSqlExtensionsVisitor}
 import org.opensearch.flint.spark.sql.FlintSparkSqlAstBuilder.{getFullTableName, isAutoRefreshEnabled}
-import org.opensearch.flint.spark.sql.FlintSparkSqlExtensionsParser.{CreateCoveringIndexStatementContext, DropCoveringIndexStatementContext, RefreshCoveringIndexStatementContext}
+import org.opensearch.flint.spark.sql.FlintSparkSqlExtensionsParser._
 
+import org.apache.spark.sql.Row
+import org.apache.spark.sql.catalyst.expressions.AttributeReference
 import org.apache.spark.sql.catalyst.plans.logical.Command
+import org.apache.spark.sql.types.StringType
 
 /**
  * Flint Spark AST builder that builds Spark command for Flint covering index statement.
@@ -55,6 +58,41 @@ trait FlintSparkCoveringIndexAstBuilder extends FlintSparkSqlExtensionsVisitor[C
     }
   }
 
+  override def visitShowCoveringIndexStatement(
+      ctx: ShowCoveringIndexStatementContext): Command = {
+    val outputSchema = Seq(AttributeReference("index_name", StringType, nullable = false)())
+
+    FlintSparkSqlCommand(outputSchema) { flint =>
+      val fullTableName = getFullTableName(flint, ctx.tableName)
+      val indexNamePattern = FlintSparkCoveringIndex.getFlintIndexName("*", fullTableName)
+      flint
+        .describeIndexes(indexNamePattern)
+        .collect { case index: FlintSparkCoveringIndex =>
+          Row(index.indexName)
+        }
+    }
+  }
+
+  override def visitDescribeCoveringIndexStatement(
+      ctx: DescribeCoveringIndexStatementContext): Command = {
+    val outputSchema = Seq(
+      AttributeReference("indexed_col_name", StringType, nullable = false)(),
+      AttributeReference("data_type", StringType, nullable = false)(),
+      AttributeReference("index_type", StringType, nullable = false)())
+
+    FlintSparkSqlCommand(outputSchema) { flint =>
+      val indexName = getFlintIndexName(flint, ctx.indexName, ctx.tableName)
+      flint
+        .describeIndex(indexName)
+        .map { case index: FlintSparkCoveringIndex =>
+          index.indexedColumns.map { case (colName, colType) =>
+            Row(colName, colType, "indexed")
+          }.toSeq
+        }
+        .getOrElse(Seq.empty)
+    }
+  }
+
   override def visitDropCoveringIndexStatement(
       ctx: DropCoveringIndexStatementContext): Command = {
     FlintSparkSqlCommand() { flint =>

integ-test/src/test/scala/org/opensearch/flint/core/FlintOpenSearchClientSuite.scala

@@ -43,6 +43,13 @@ class FlintOpenSearchClientSuite extends AnyFlatSpec with OpenSearchSuite with M
     flintClient.getIndexMetadata(indexName).getContent should matchJson(content)
   }
 
+  it should "get all index metadata with the given index name pattern" in {
+    flintClient.createIndex("flint_test_1_index", new FlintMetadata("{}"))
+    flintClient.createIndex("flint_test_2_index", new FlintMetadata("{}"))
+
+    flintClient.getAllIndexMetadata("flint_*_index") should have size 2
+  }
+
   it should "return false if index not exist" in {
     flintClient.exists("non-exist-index") shouldBe false
   }

integ-test/src/test/scala/org/opensearch/flint/spark/FlintSparkCoveringIndexSqlITSuite.scala

@@ -8,9 +8,12 @@ package org.opensearch.flint.spark
 import scala.Option.empty
 
 import org.opensearch.flint.spark.covering.FlintSparkCoveringIndex.getFlintIndexName
+import org.opensearch.flint.spark.skipping.FlintSparkSkippingIndex.getSkippingIndexName
 import org.scalatest.matchers.must.Matchers.defined
 import org.scalatest.matchers.should.Matchers.convertToAnyShouldWrapper
 
+import org.apache.spark.sql.Row
+
 class FlintSparkCoveringIndexSqlITSuite extends FlintSparkSuite {
 
   /** Test table and index name */
@@ -64,6 +67,48 @@ class FlintSparkCoveringIndexSqlITSuite extends FlintSparkSuite {
     indexData.count() shouldBe 2
   }
 
+  test("show all covering index on the source table") {
+    flint
+      .coveringIndex()
+      .name(testIndex)
+      .onTable(testTable)
+      .addIndexColumns("name", "age")
+      .create()
+
+    // Create another covering index
+    flint
+      .coveringIndex()
+      .name("idx_address")
+      .onTable(testTable)
+      .addIndexColumns("address")
+      .create()
+
+    // Create a skipping index which is expected to be filtered
+    flint
+      .skippingIndex()
+      .onTable(testTable)
+      .addPartitions("year", "month")
+      .create()
+
+    val result = sql(s"SHOW INDEX ON $testTable")
+    checkAnswer(result, Seq(Row(testIndex), Row("idx_address")))
+
+    flint.deleteIndex(getFlintIndexName("idx_address", testTable))
+    flint.deleteIndex(getSkippingIndexName(testTable))
+  }
+
+  test("describe covering index") {
+    flint
+      .coveringIndex()
+      .name(testIndex)
+      .onTable(testTable)
+      .addIndexColumns("name", "age")
+      .create()
+
+    val result = sql(s"DESC INDEX $testIndex ON $testTable")
+    checkAnswer(result, Seq(Row("name", "string", "indexed"), Row("age", "int", "indexed")))
+  }
+
   test("drop covering index") {
     flint
       .coveringIndex()