WIP: Support chart command in PPL

core/src/main/java/org/opensearch/sql/analysis/Analyzer.java

@@ -61,6 +61,7 @@
 import org.opensearch.sql.ast.tree.Append;
 import org.opensearch.sql.ast.tree.AppendCol;
 import org.opensearch.sql.ast.tree.Bin;
+import org.opensearch.sql.ast.tree.Chart;
 import org.opensearch.sql.ast.tree.CloseCursor;
 import org.opensearch.sql.ast.tree.Dedupe;
 import org.opensearch.sql.ast.tree.Eval;
@@ -764,6 +765,11 @@ public LogicalPlan visitSpath(SPath node, AnalysisContext context) {
     throw getOnlyForCalciteException("Spath");
   }
 
+  @Override
+  public LogicalPlan visitChart(Chart node, AnalysisContext context) {
+    throw getOnlyForCalciteException("Chart");
+  }
+
   @Override
   public LogicalPlan visitTimechart(Timechart node, AnalysisContext context) {
     throw getOnlyForCalciteException("Timechart");

core/src/main/java/org/opensearch/sql/ast/AbstractNodeVisitor.java

@@ -49,6 +49,7 @@
 import org.opensearch.sql.ast.tree.Append;
 import org.opensearch.sql.ast.tree.AppendCol;
 import org.opensearch.sql.ast.tree.Bin;
+import org.opensearch.sql.ast.tree.Chart;
 import org.opensearch.sql.ast.tree.CloseCursor;
 import org.opensearch.sql.ast.tree.Dedupe;
 import org.opensearch.sql.ast.tree.Eval;
@@ -274,6 +275,10 @@ public T visitReverse(Reverse node, C context) {
     return visitChildren(node, context);
   }
 
+  public T visitChart(Chart node, C context) {
+    return visitChildren(node, context);
+  }
+
   public T visitTimechart(Timechart node, C context) {
     return visitChildren(node, context);
   }

core/src/main/java/org/opensearch/sql/ast/tree/Chart.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.sql.ast.tree;
+
+import com.google.common.collect.ImmutableList;
+import java.util.List;
+import lombok.AllArgsConstructor;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.ToString;
+import org.opensearch.sql.ast.AbstractNodeVisitor;
+import org.opensearch.sql.ast.dsl.AstDSL;
+import org.opensearch.sql.ast.expression.Argument;
+import org.opensearch.sql.ast.expression.Literal;
+import org.opensearch.sql.ast.expression.UnresolvedExpression;
+
+/** AST node represent chart command. */
+@Getter
+@ToString
+@EqualsAndHashCode(callSuper = false)
+@AllArgsConstructor
+@lombok.Builder(toBuilder = true)
+public class Chart extends UnresolvedPlan {
+  public static final Literal DEFAULT_USE_OTHER = Literal.TRUE;
+  public static final Literal DEFAULT_OTHER_STR = AstDSL.stringLiteral("OTHER");
+  public static final Literal DEFAULT_LIMIT = AstDSL.intLiteral(10);
+  public static final Literal DEFAULT_USE_NULL = Literal.TRUE;
+  public static final Literal DEFAULT_NULL_STR = AstDSL.stringLiteral("NULL");
+  public static final Literal DEFAULT_TOP = Literal.TRUE;
+
+  private UnresolvedPlan child;
+  private UnresolvedExpression rowSplit;
+  private UnresolvedExpression columnSplit;
+  private UnresolvedExpression aggregationFunction;
+  private List<Argument> arguments;
+
+  @Override
+  public UnresolvedPlan attach(UnresolvedPlan child) {
+    this.child = child;
+    return this;
+  }
+
+  @Override
+  public List<UnresolvedPlan> getChild() {
+    return this.child == null ? ImmutableList.of() : ImmutableList.of(this.child);
+  }
+
+  @Override
+  public <T, C> T accept(AbstractNodeVisitor<T, C> nodeVisitor, C context) {
+    return nodeVisitor.visitChart(this, context);
+  }
+}