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https://issues.apache.org/jira/browse/SPARK-32672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17182156#comment-17182156
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Dongjoon Hyun commented on SPARK-32672:
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Thank you, [~revans2].
> 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: 2.2.3, 2.3.4, 2.4.6, 3.0.0, 3.0.1, 3.1.0
> Reporter: Robert Joseph Evans
> Priority: Blocker
> Labels: correctness
> 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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