Github user ron8hu commented on a diff in the pull request:
https://github.com/apache/spark/pull/16395#discussion_r95710436
--- 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)
+ val filterNode = Filter(condition, child)
--- End diff --
NA as it is overwritten.
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