fixup

Author: pabloem

x-pack/plugin/esql/compute/src/main/generated-src/org/elasticsearch/compute/aggregation/DerivDoubleGroupingAggregatorFunction.java

@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
 package org.elasticsearch.compute.aggregation;
 
 class SimpleLinearRegressionWithTimeseries {

x-pack/plugin/esql/compute/src/main/generated-src/org/elasticsearch/compute/aggregation/DerivIntGroupingAggregatorFunction.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+package org.elasticsearch.compute.aggregation;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+
+class SimpleLinearRegressionWithTimeseries {
+    long count;
+    double sumVal;
+    long sumTs;
+    double sumTsVal;
+    long sumTsSq;
+
+    SimpleLinearRegressionWithTimeseries() {
+        this.count = 0;
+        this.sumVal = 0.0;
+        this.sumTs = 0;
+        this.sumTsVal = 0.0;
+        this.sumTsSq = 0;
+    }
+
+    void add(long ts, double val) {
+        count++;
+        sumVal += val;
+        sumTs += ts;
+        sumTsVal += ts * val;
+        sumTsSq += ts * ts;
+    }
+
+    double slope() {
+        if (count <= 1) {
+            return Double.NaN;
+        }
+        double numerator = count * sumTsVal - sumTs * sumVal;
+        double denominator = count * sumTsSq - sumTs * sumTs;
+        if (denominator == 0) {
+            return Double.NaN;
+        }
+        return numerator / denominator;
+    }
+
+    double intercept() {
+        if (count == 0) {
+            return 0.0; // or handle as needed
+        }
+        return (sumVal - slope() * sumTs) / count;
+    }
+
+}

x-pack/plugin/esql/compute/src/main/generated-src/org/elasticsearch/compute/aggregation/DerivLongGroupingAggregatorFunction.java

@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
 package org.elasticsearch.compute.aggregation;
 
 import org.elasticsearch.common.util.ObjectArray;