Merge remote-tracking branch 'origin/feature/graphlookup' into poc/graphlookup

# Conflicts:
#	docs/user/ppl/index.md
#	opensearch/src/main/java/org/opensearch/sql/opensearch/storage/scan/CalciteEnumerableGraphLookup.java

Author: qianheng-aws

common/src/main/java/org/opensearch/sql/common/utils/DebugUtils.java

@@ -107,7 +107,6 @@
 import org.opensearch.sql.ast.tree.Values;
 import org.opensearch.sql.ast.tree.Window;
 import org.opensearch.sql.common.antlr.SyntaxCheckException;
-import org.opensearch.sql.common.patterns.PatternUtils;
 import org.opensearch.sql.data.model.ExprMissingValue;
 import org.opensearch.sql.data.type.ExprCoreType;
 import org.opensearch.sql.datasource.DataSourceService;
@@ -527,6 +526,12 @@ public LogicalPlan visitEval(Eval node, AnalysisContext context) {
     return new LogicalEval(child, expressionsBuilder.build());
   }
 
+  /** Build {@link LogicalEval}. */
+  @Override
+  public LogicalPlan visitFieldFormat(Eval node, AnalysisContext context) {
+    throw getOnlyForCalciteException("fieldformat");
+  }
+
   @Override
   public LogicalPlan visitAddTotals(AddTotals node, AnalysisContext context) {
     throw getOnlyForCalciteException("addtotals");
@@ -972,10 +977,10 @@ private Aggregation analyzePatternsAgg(Patterns node) {
     List<UnresolvedExpression> aggExprs =
         Stream.of(
                 new Alias(
-                    PatternUtils.PATTERN_COUNT,
+                    "pattern_count",
                     new AggregateFunction(BuiltinFunctionName.COUNT.name(), AllFields.of())),
                 new Alias(
-                    PatternUtils.SAMPLE_LOGS,
+                    "sample_logs",
                     new AggregateFunction(
                         BuiltinFunctionName.TAKE.name(),
                         node.getSourceField(),

common/src/test/java/org/opensearch/sql/common/utils/DebugUtilsTest.java

@@ -265,6 +265,10 @@ public T visitEval(Eval node, C context) {
     return visitChildren(node, context);
   }
 
+  public T visitFieldFormat(Eval node, C context) {
+    return visitChildren(node, context);
+  }
+
   public T visitParse(Parse node, C context) {
     return visitChildren(node, context);
   }