Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/10942#discussion_r51531853
--- Diff:
sql/hive/src/test/scala/org/apache/spark/sql/sources/BucketedReadSuite.scala ---
@@ -59,6 +61,159 @@ class BucketedReadSuite extends QueryTest with
SQLTestUtils with TestHiveSinglet
}
}
+ // To verify if the bucket pruning works, this function checks two
conditions:
+ // 1) Check if the pruned buckets (before filtering) are empty.
+ // 2) Verify the final result is the same as the expected one
+ private def checkPrunedAnswers(
+ bucketSpec: BucketSpec,
+ bucketValues: Seq[Integer],
+ bucketedDataFrame: DataFrame,
+ expectedAnswer: DataFrame): Unit = {
+
+ val BucketSpec(numBuckets, bucketColumnNames, _) = bucketSpec
+ // Limit: bucket pruning only works when the bucket column has one and
only one column
+ assert(bucketColumnNames.length == 1)
+ val bucketColumnIndex =
bucketedDataFrame.schema.fieldIndex(bucketColumnNames.head)
+ val bucketColumn = bucketedDataFrame.schema.toAttributes.head
+ val matchedBuckets = new BitSet(numBuckets)
+ bucketValues.foreach { value =>
+ matchedBuckets.set(DataSourceStrategy.getBucketId(bucketColumn,
numBuckets, value))
+ }
+
+ // Filter could hide the bug in bucket pruning. Thus, skipping all the
filters
+ val rdd =
bucketedDataFrame.queryExecution.executedPlan.find(_.isInstanceOf[PhysicalRDD])
+ assert(rdd.isDefined)
+
+ val checkBucketId = rdd.get.execute().map(_.copy()).mapPartitions(iter
=> {
+ iter.map(row =>
+ DataSourceStrategy.getBucketId(
+ bucketColumn, numBuckets, row.get(bucketColumnIndex,
bucketColumn.dataType)))})
+ // Check if all the returned rows are from the non-pruned buckets
+ assert(checkBucketId.collect().forall(matchedBuckets.get))
+
+ checkAnswer(
+ expectedAnswer
+ .orderBy(expectedAnswer.logicalPlan.output.map(attr =>
Column(attr)) : _*),
--- End diff --
There is a test case which is using a different Dataframe `nullStrings`.
Thus, the schema is different. If you want, I can create a dataFrame with the
same schema for this test case. Let me know if you want me to do the change.
Thanks!
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