Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/16243#discussion_r91830853
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/StatisticsCollectionSuite.scala ---
@@ -180,35 +214,28 @@ abstract class StatisticsCollectionTestBase extends
QueryTest with SQLTestUtils
"ctimestamp" -> ColumnStat(2, Some(t1), Some(t2), 1, 8, 8)
)
- test("column stats round trip serialization") {
- // Make sure we serialize and then deserialize and we will get the
result data
- val df = data.toDF(stats.keys.toSeq :+ "carray" : _*)
- stats.zip(df.schema).foreach { case ((k, v), field) =>
- withClue(s"column $k with type ${field.dataType}") {
- val roundtrip = ColumnStat.fromMap("table_is_foo", field, v.toMap)
- assert(roundtrip == Some(v))
- }
- }
- }
-
- test("analyze column command - result verification") {
- val tableName = "column_stats_test2"
- // (data.head.productArity - 1) because the last column does not
support stats collection.
- assert(stats.size == data.head.productArity - 1)
- val df = data.toDF(stats.keys.toSeq :+ "carray" : _*)
+ private val randomName = new Random(31)
+ /**
+ * Compute column stats for the given DataFrame and compare it with
colStats.
+ */
+ def checkColStats(
+ df: DataFrame,
+ colStats: mutable.LinkedHashMap[String, ColumnStat]): Unit = {
+ val tableName = "column_stats_test_" + randomName.nextInt(10)
--- End diff --
the chance of collision here is not low. just use a broader key space
nextInt
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