Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21054#discussion_r185444248
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/regression.scala
---
@@ -0,0 +1,193 @@
+/*
+ * 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.
+ */
+
+package org.apache.spark.sql.catalyst.expressions.aggregate
+
+import org.apache.spark.sql.catalyst.dsl.expressions._
+import org.apache.spark.sql.catalyst.expressions.{Expression,
ExpressionDescription, If, ImplicitCastInputTypes, IsNull, Literal, Or}
+import org.apache.spark.sql.types.{AbstractDataType, DoubleType}
+
+/**
+ * Base trait for all regression functions.
+ */
+trait RegrBase extends AggregateFunction with ImplicitCastInputTypes {
--- End diff --
it needs to be a trait to be mixed in with the other abstract classes
(`CountLike`, `AggregateLike`, `CentralMomentAgg`, ...)
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