Github user ron8hu commented on a diff in the pull request:
https://github.com/apache/spark/pull/16696#discussion_r99474494
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/statsEstimation/StatsEstimationSuite.scala
---
@@ -18,12 +18,41 @@
package org.apache.spark.sql.catalyst.statsEstimation
import org.apache.spark.sql.catalyst.CatalystConf
-import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeMap,
AttributeReference}
-import org.apache.spark.sql.catalyst.plans.logical.{ColumnStat,
LogicalPlan, Statistics}
+import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeMap,
AttributeReference, Literal}
+import org.apache.spark.sql.catalyst.plans.logical._
import org.apache.spark.sql.types.IntegerType
-class StatsConfSuite extends StatsEstimationTestBase {
+class StatsEstimationSuite extends StatsEstimationTestBase {
+ val (ar, colStat) = (attr("key"), ColumnStat(distinctCount = 10, min =
Some(1), max = Some(10),
+ nullCount = 0, avgLen = 4, maxLen = 4))
+
+ val plan = StatsTestPlan(
+ outputList = Seq(ar),
+ attributeStats = AttributeMap(Seq(ar -> colStat)),
+ rowCount = 10,
+ size = Some(10 * (8 + 4)))
+
+ test("limit estimation") {
+ val localLimit = LocalLimit(Literal(2), plan)
+ val globalLimit = GlobalLimit(Literal(2), plan)
+ // LocalLimit and GlobalLimit share the same stats estimation logic.
+ val expected = Statistics(sizeInBytes = 24, rowCount = Some(2))
+ checkStats(localLimit, expected)
+ checkStats(globalLimit, expected)
+ }
+
+ test("sample estimation") {
+ val sample = Sample(0.0, 0.5, withReplacement = false, (math.random *
1000).toLong, plan)()
+ checkStats(sample, expected = Statistics(sizeInBytes = 60, rowCount =
Some(5)))
+
+ // Test if Sample's child doesn't have rowCount in stats
+ val stats2 = Statistics(sizeInBytes = 120)
--- End diff --
For limit estimation test cases, we may add a test with limit number
greater than a child node's row count. This test can show if we properly
select the smaller value between limit number child node's row count.
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