huaxingao commented on PR #1028:
URL: https://github.com/apache/parquet-mr/pull/1028#issuecomment-1432481988
I did a quick test using Spark
```
Seq("A", "A",
null).toDF("column").repartition(1).write.mode("overwrite").parquet("t")
spark.read.parquet("t").where("NOT (column <=> 'A')").show //
this returns null
spark.read.parquet("t").where("NOT (column = 'A')").show //
this returns empty
spark.read.parquet("t").where("column IN ('A')").show // this
returns A A
spark.read.parquet("t").where("column NOT IN ('A')").show //
this returns empty
```
If we only has `A` and `null` for `column` and we have predicate `column not
in ('A')`, should we return empty instead of null?
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