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https://issues.apache.org/jira/browse/SPARK-32672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17182225#comment-17182225
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Hyukjin Kwon commented on SPARK-32672:
--------------------------------------
[~revans2] is a PMC, and it is a correctness issue. This indeed is a blocker. I
think the initial action was a mistake.
I think [~cltlfcjin] referred:
{quote}
Set to Major or below; higher priorities are generally reserved for committers
to set.
{quote}
I fully agree that ideally we should first evaluate what they are reporting
with stating the reason.
The problem is that we don't have a lot of manpower here in triaging/managing
JIRAs. It's just that there are not so many people who do.
Given this situation, I would like to encourage to aggressively triage - there
are many JIRAs that set priority incorrectly.
For example, many JIRAs just ask questions and/or investigations with setting
the priority as a blocker. Such blockers matter for release managers.
If we want more fine-grained and ideal evaluation of JIRAs, I would encourage
our PMC members to take a look more often.
> Data corruption in some cached compressed boolean columns
> ---------------------------------------------------------
>
> Key: SPARK-32672
> URL: https://issues.apache.org/jira/browse/SPARK-32672
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.4, 2.4.6, 3.0.0, 3.0.1, 3.1.0
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Priority: Blocker
> Labels: correctness
> Fix For: 2.4.7, 3.0.1, 3.1.0
>
> Attachments: bad_order.snappy.parquet, small_bad.snappy.parquet
>
>
> I found that when sorting some boolean data into the cache that the results
> can change when the data is read back out.
> It needs to be a non-trivial amount of data, and it is highly dependent on
> the order of the data. If I disable compression in the cache the issue goes
> away. I was able to make this happen in 3.0.0. I am going to try and
> reproduce it in other versions too.
> I'll attach the parquet file with boolean data in an order that causes this
> to happen. As you can see after the data is cached a single null values
> switches over to be false.
> {code}
> scala> val bad_order = spark.read.parquet("./bad_order.snappy.parquet")
> bad_order: org.apache.spark.sql.DataFrame = [b: boolean]
>
> scala> bad_order.groupBy("b").count.show
> +-----+-----+
> | b|count|
> +-----+-----+
> | null| 7153|
> | true|54334|
> |false|54021|
> +-----+-----+
> scala> bad_order.cache()
> res1: bad_order.type = [b: boolean]
> scala> bad_order.groupBy("b").count.show
> +-----+-----+
> | b|count|
> +-----+-----+
> | null| 7152|
> | true|54334|
> |false|54022|
> +-----+-----+
> scala>
> {code}
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