Improved patterns command with new algorithm

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

@@ -36,6 +36,7 @@
 import org.opensearch.sql.analysis.symbol.Namespace;
 import org.opensearch.sql.analysis.symbol.Symbol;
 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.Field;
 import org.opensearch.sql.ast.expression.Let;
@@ -58,6 +59,7 @@
 import org.opensearch.sql.ast.tree.ML;
 import org.opensearch.sql.ast.tree.Paginate;
 import org.opensearch.sql.ast.tree.Parse;
+import org.opensearch.sql.ast.tree.Pattern;
 import org.opensearch.sql.ast.tree.Project;
 import org.opensearch.sql.ast.tree.RareTopN;
 import org.opensearch.sql.ast.tree.Relation;
@@ -107,6 +109,7 @@
 import org.opensearch.sql.planner.logical.LogicalSort;
 import org.opensearch.sql.planner.logical.LogicalTrendline;
 import org.opensearch.sql.planner.logical.LogicalValues;
+import org.opensearch.sql.planner.logical.LogicalWindow;
 import org.opensearch.sql.planner.physical.datasource.DataSourceTable;
 import org.opensearch.sql.storage.Table;
 import org.opensearch.sql.utils.ParseUtils;
@@ -471,6 +474,31 @@ public LogicalPlan visitParse(Parse node, AnalysisContext context) {
     return child;
   }
 
+  @Override
+  public LogicalPlan visitPattern(Pattern node, AnalysisContext context) {
+    LogicalPlan child = node.getChild().get(0).accept(this, context);
+    WindowExpressionAnalyzer windowAnalyzer =
+        new WindowExpressionAnalyzer(expressionAnalyzer, child);
+    child = windowAnalyzer.analyze(node.getPatternWindowFunction(), context);
+    java.util.Map<String, Literal> arguments = node.getArguments();
+    Literal alias = arguments.getOrDefault("new_field", AstDSL.stringLiteral("patterns_field"));
+
+    TypeEnvironment curEnv = context.peek();
+    if (child instanceof LogicalWindow patternWindow) {
+      NamedExpression namedExpression =
+          new NamedExpression(
+              patternWindow.getWindowFunction().getNameOrAlias(),
+              new ReferenceExpression(
+                  patternWindow.getWindowFunction().getNameOrAlias(),
+                  patternWindow.getWindowFunction().getDelegated().type()));
+      curEnv.define(
+          new Symbol(Namespace.FIELD_NAME, namedExpression.getNameOrAlias()),
+          namedExpression.type());
+    }
+
+    return child;
+  }
+
   /** Build {@link LogicalSort}. */
   @Override
   public LogicalPlan visitSort(Sort node, AnalysisContext context) {

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

@@ -53,6 +53,7 @@
 import org.opensearch.sql.ast.tree.ML;
 import org.opensearch.sql.ast.tree.Paginate;
 import org.opensearch.sql.ast.tree.Parse;
+import org.opensearch.sql.ast.tree.Pattern;
 import org.opensearch.sql.ast.tree.Project;
 import org.opensearch.sql.ast.tree.RareTopN;
 import org.opensearch.sql.ast.tree.Relation;
@@ -215,6 +216,10 @@ public T visitParse(Parse node, C context) {
     return visitChildren(node, context);
   }
 
+  public T visitPattern(Pattern node, C context) {
+    return visitChildren(node, context);
+  }
+
   public T visitLet(Let node, C context) {
     return visitChildren(node, context);
   }

core/src/main/java/org/opensearch/sql/ast/dsl/AstDSL.java

@@ -36,6 +36,7 @@
 import org.opensearch.sql.ast.expression.Not;
 import org.opensearch.sql.ast.expression.Or;
 import org.opensearch.sql.ast.expression.ParseMethod;
+import org.opensearch.sql.ast.expression.PatternMethod;
 import org.opensearch.sql.ast.expression.QualifiedName;
 import org.opensearch.sql.ast.expression.ScoreFunction;
 import org.opensearch.sql.ast.expression.Span;
@@ -54,6 +55,7 @@
 import org.opensearch.sql.ast.tree.Head;
 import org.opensearch.sql.ast.tree.Limit;
 import org.opensearch.sql.ast.tree.Parse;
+import org.opensearch.sql.ast.tree.Pattern;
 import org.opensearch.sql.ast.tree.Project;
 import org.opensearch.sql.ast.tree.RareTopN;
 import org.opensearch.sql.ast.tree.RareTopN.CommandType;
@@ -489,6 +491,22 @@ public static Parse parse(
     return new Parse(parseMethod, sourceField, pattern, arguments, input);
   }
 
+  public static Pattern pattern(
+      UnresolvedPlan input,
+      PatternMethod patternMethod,
+      UnresolvedExpression sourceField,
+      String alias,
+      java.util.Map<String, Literal> arguments) {
+    return new Pattern(
+        new Alias(
+            "patterns_field",
+            new WindowFunction(
+                new Function(patternMethod.getName(), List.of(sourceField)), List.of(), List.of()),
+            alias),
+        arguments,
+        input);
+  }
+
   public static FillNull fillNull(UnresolvedExpression replaceNullWithMe, Field... fields) {
     return new FillNull(
         FillNull.ContainNullableFieldFill.ofSameValue(

core/src/main/java/org/opensearch/sql/ast/expression/ParseMethod.java

@@ -11,8 +11,7 @@
 @RequiredArgsConstructor
 public enum ParseMethod {
   REGEX("regex"),
-  GROK("grok"),
-  PATTERNS("patterns");
+  GROK("grok");
 
   @Getter private final String name;
 }

core/src/main/java/org/opensearch/sql/ast/expression/PatternMethod.java

@@ -0,0 +1,20 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.sql.ast.expression;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public enum PatternMethod {
+  SIMPLE("simple"),
+  BRAIN("brain");
+
+  @Getter final String name;
+}

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

@@ -0,0 +1,53 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.sql.ast.tree;
+
+import com.google.common.collect.ImmutableList;
+import java.util.List;
+import java.util.Map;
+import lombok.AllArgsConstructor;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+import lombok.ToString;
+import org.opensearch.sql.ast.AbstractNodeVisitor;
+import org.opensearch.sql.ast.expression.Literal;
+import org.opensearch.sql.ast.expression.UnresolvedExpression;
+
+@Getter
+@Setter
+@ToString
+@EqualsAndHashCode(callSuper = false)
+@RequiredArgsConstructor
+@AllArgsConstructor
+public class Pattern extends UnresolvedPlan {
+
+  private final UnresolvedExpression patternWindowFunction;
+
+  private final Map<String, Literal> arguments;
+
+  private UnresolvedPlan child;
+
+  @Override
+  public Pattern attach(UnresolvedPlan child) {
+    this.child = child;
+    return this;
+  }
+
+  @Override
+  public List<UnresolvedPlan> getChild() {
+    return ImmutableList.of(this.child);
+  }
+
+  @Override
+  public <T, C> T accept(AbstractNodeVisitor<T, C> nodeVisitor, C context) {
+    return nodeVisitor.visitPattern(this, context);
+  }
+}

core/src/main/java/org/opensearch/sql/expression/DSL.java

@@ -969,6 +969,14 @@ public static FunctionExpression utc_timestamp(
     return compile(functionProperties, BuiltinFunctionName.UTC_TIMESTAMP, args);
   }
 
+  public static FunctionExpression brain() {
+    return compile(FunctionProperties.None, BuiltinFunctionName.BRAIN);
+  }
+
+  public static FunctionExpression simple_pattern() {
+    return compile(FunctionProperties.None, BuiltinFunctionName.SIMPLE_PATTERN);
+  }
+
   @SuppressWarnings("unchecked")
   private static <T extends FunctionImplementation> T compile(
       FunctionProperties functionProperties, BuiltinFunctionName bfn, Expression... args) {

core/src/main/java/org/opensearch/sql/expression/function/BuiltinFunctionName.java

@@ -216,6 +216,9 @@ public enum BuiltinFunctionName {
   RANK(FunctionName.of("rank")),
   DENSE_RANK(FunctionName.of("dense_rank")),
 
+  SIMPLE_PATTERN(FunctionName.of("simple_pattern")),
+  BRAIN(FunctionName.of("brain")),
+
   INTERVAL(FunctionName.of("interval")),
 
   /** Data Type Convert Function. */

core/src/main/java/org/opensearch/sql/expression/parse/PatternsExpression.java

@@ -50,7 +50,7 @@ public PatternsExpression(Expression sourceField, Expression pattern, Expression
   }
 
   @Override
-  ExprValue parseValue(ExprValue value) throws ExpressionEvaluationException {
+  public ExprValue parseValue(ExprValue value) throws ExpressionEvaluationException {
     String rawString = value.stringValue();
     if (useCustomPattern) {
       return new ExprStringValue(pattern.matcher(rawString).replaceAll(""));

core/src/main/java/org/opensearch/sql/expression/window/WindowFunctions.java

@@ -6,8 +6,10 @@
 package org.opensearch.sql.expression.window;
 
 import static java.util.Collections.emptyList;
+import static org.opensearch.sql.data.type.ExprCoreType.STRING;
 
 import com.google.common.collect.ImmutableMap;
+import java.util.Collections;
 import java.util.function.Supplier;
 import lombok.experimental.UtilityClass;
 import org.opensearch.sql.expression.function.BuiltinFunctionName;
@@ -16,6 +18,8 @@
 import org.opensearch.sql.expression.function.FunctionBuilder;
 import org.opensearch.sql.expression.function.FunctionName;
 import org.opensearch.sql.expression.function.FunctionSignature;
+import org.opensearch.sql.expression.window.patterns.BufferPatternWindowFunction;
+import org.opensearch.sql.expression.window.patterns.StreamPatternWindowFunction;
 import org.opensearch.sql.expression.window.ranking.DenseRankFunction;
 import org.opensearch.sql.expression.window.ranking.RankFunction;
 import org.opensearch.sql.expression.window.ranking.RankingWindowFunction;
@@ -34,6 +38,8 @@ public void register(BuiltinFunctionRepository repository) {
     repository.register(rowNumber());
     repository.register(rank());
     repository.register(denseRank());
+    repository.register(brain());
+    repository.register(simplePattern());
   }
 
   private DefaultFunctionResolver rowNumber() {
@@ -48,6 +54,26 @@ private DefaultFunctionResolver denseRank() {
     return rankingFunction(BuiltinFunctionName.DENSE_RANK.getName(), DenseRankFunction::new);
   }
 
+  private DefaultFunctionResolver brain() {
+    FunctionName functionName = BuiltinFunctionName.BRAIN.getName();
+    FunctionSignature functionSignature =
+        new FunctionSignature(functionName, Collections.singletonList(STRING));
+    FunctionBuilder functionBuilder =
+        (functionProperties, arguments) -> new BufferPatternWindowFunction(arguments);
+    return new DefaultFunctionResolver(
+        functionName, ImmutableMap.of(functionSignature, functionBuilder));
+  }
+
+  private DefaultFunctionResolver simplePattern() {
+    FunctionName functionName = BuiltinFunctionName.SIMPLE_PATTERN.getName();
+    FunctionSignature functionSignature =
+        new FunctionSignature(functionName, Collections.singletonList(STRING));
+    FunctionBuilder functionBuilder =
+        (functionProperties, arguments) -> new StreamPatternWindowFunction(arguments);
+    return new DefaultFunctionResolver(
+        functionName, ImmutableMap.of(functionSignature, functionBuilder));
+  }
+
   private DefaultFunctionResolver rankingFunction(
       FunctionName functionName, Supplier<RankingWindowFunction> constructor) {
     FunctionSignature functionSignature = new FunctionSignature(functionName, emptyList());

core/src/main/java/org/opensearch/sql/expression/window/frame/BufferPatternRowsWindowFrame.java

@@ -0,0 +1,62 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.sql.expression.window.frame;
+
+import com.google.common.collect.PeekingIterator;
+import java.util.ArrayList;
+import java.util.List;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.ToString;
+import org.opensearch.sql.common.patterns.BrainLogParser;
+import org.opensearch.sql.data.model.ExprValue;
+import org.opensearch.sql.expression.Expression;
+import org.opensearch.sql.expression.window.WindowDefinition;
+
+@EqualsAndHashCode(callSuper = true)
+@ToString
+public class BufferPatternRowsWindowFrame extends PeerRowsWindowFrame {
+
+  private final Expression sourceField;
+
+  @Getter private final BrainLogParser logParser;
+
+  private final List<List<String>> preprocessedMessages;
+
+  public BufferPatternRowsWindowFrame(
+      WindowDefinition windowDefinition, BrainLogParser logParser, Expression sourceField) {
+    super(windowDefinition);
+    this.logParser = logParser;
+    this.sourceField = sourceField;
+    this.preprocessedMessages = new ArrayList<>();
+  }
+
+  @Override
+  public void load(PeekingIterator<ExprValue> it) {
+    if (hasNext()) {
+      return;
+    }
+
+    loadAllRows(it);
+
+    List<String> logMessages =
+        peers.stream()
+            .map(
+                exprValue -> {
+                  ExprValue value = sourceField.valueOf(exprValue.bindingTuples());
+                  return value.stringValue();
+                })
+            .toList();
+    this.preprocessedMessages.addAll(logParser.preprocessAllLogs(logMessages));
+  }
+
+  public List<String> currentPreprocessedMessage() {
+    return this.preprocessedMessages.get(position);
+  }
+}