Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/22419#discussion_r218408565
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/MathUtils.scala
---
@@ -0,0 +1,52 @@
+/*
+ * 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.util
+
+import java.math.{BigDecimal => JBigDecimal}
+
+object MathUtils {
+
+ /**
+ * Returns double type input truncated to scale decimal places.
+ */
+ def trunc(input: Double, scale: Int): Double = {
--- End diff --
Why do you put this function in a separate file? Any plan to reuse this?
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