Trivial Description
The appendRowUntilExceedingPageSize test at sql/catalyst/src/test/java/org/apache/spark/sql/catalyst/expressions/RowBasedKeyValueBatchSuite.java always uses the default page size which is 64 MB for running the test
Users with less powerful machines (e.g. those with two cores) may opt to choose a smaller spark.buffer.pageSize value in order to prevent problems acquiring memory
If this size is reduced, let's say to 1 MB, this test will fail, here is the problem scenario
We run with 1,048,576 page size (1 mb)
Default is 67,108,864 size (64 mb)
Test fails: java.lang.AssertionError: expected:<14563> but was:<932067>
932,067 is 64x bigger than 14,563 and the default page size is 64x bigger than 1 MB (which is when we see the failure)
The failure is at
Assert.assertEquals(batch.numRows(), numRows);
This minor improvement has the test use whatever the user has specified (looks for spark.buffer.pageSize) to prevent this problem from occurring for anyone testing Apache Spark on a box with a reduced page size.
