Github user wangyum commented on a diff in the pull request:
https://github.com/apache/spark/pull/18323#discussion_r128482031
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/MathUtils.scala
---
@@ -0,0 +1,57 @@
+/*
+ * 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 org.apache.spark.sql.AnalysisException
+
+object MathUtils {
+
+ /**
+ * Returns the bucket number into which
+ * the value of this expression would fall after being evaluated.
+ *
+ * @param expr is the expression for which the histogram is being created
+ * @param minValue is an expression that resolves
+ * to the minimum end point of the acceptable range for
expr
+ * @param maxValue is an expression that resolves
+ * to the maximum end point of the acceptable range for
expr
+ * @param numBucket is an expression that resolves to
+ * a constant indicating the number of buckets
+ * @return Returns an long between 0 and numBucket+1 by mapping the expr
into buckets defined by
+ * the range [minValue, maxValue].
+ */
+ def widthBucket(expr: Double, minValue: Double, maxValue: Double,
numBucket: Long): Long = {
+
+ if (numBucket <= 0) {
+ throw new AnalysisException(s"The num of bucket must be greater than
0, but got ${numBucket}")
+ }
+
+ val lower: Double = Math.min(minValue, maxValue)
+ val upper: Double = Math.max(minValue, maxValue)
+
+ val result: Long = if (expr < lower) {
+ 0
+ } else if (expr >= upper) {
+ numBucket + 1L
--- End diff --
Added 2 test case:
https://github.com/apache/spark/pull/18323/commits/099db6d32583dce473757a9ffc715ff4c4b44265#diff-96c9a63f4a212cd144bc18cf7063b649R674
---
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