Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/16395#discussion_r95522619 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/statsEstimation/FilterEstimationSuite.scala --- @@ -0,0 +1,173 @@ +/* + * 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.statsEstimation + +import org.apache.spark.sql.catalyst.expressions._ +import org.apache.spark.sql.catalyst.plans.logical._ +import org.apache.spark.sql.catalyst.plans.logical.statsEstimation.EstimationUtils._ +import org.apache.spark.sql.types.IntegerType + +/** + * In this test suite, we test the proedicates containing the following operators: + * =, <, <=, >, >=, AND, OR, IS NULL, IS NOT NULL, IN, NOT IN + */ + +class FilterEstimationSuite extends StatsEstimationTestBase { + + // Suppose our test table has one column called "key1". + // It has 10 rows with values: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 + // Hence, distinctCount:10, min:1, max:10, nullCount:0, avgLen:4, maxLen:4 + val ar = AttributeReference("key1", IntegerType)() + val childColStat = ColumnStat(10, Some(1), Some(10), 0, 4, 4) + val child = StatsTestPlan( + outputList = Seq(ar), + stats = Statistics( + sizeInBytes = 10 * 4, + rowCount = Some(10), + attributeStats = AttributeMap(Seq(ar -> childColStat)) + ) + ) + + test("filter estimation with equality comparison") { + // the predicate is "WHERE key1 = 2" + val intValue = Literal(2, IntegerType) + val condition = EqualTo(ar, intValue) --- End diff -- ok i now read through the test case. to make it more readable, I'd write it like this: ``` validateEstimatedStats( Filter(EqualTo(ar, Literal(2)), child), ColumnStat(distinctCount = 1, min = Some(2), max = Some(2), nullCount = 0, avgLen = 4, maxLen = 4) ) ```
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