Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/20265
Hi, @cloud-fan and @gatorsmile .
Your questions are valid for all PPD cases. According to the comments, I
added the following expressions (positive and negative) for both ORC/Parquet.
```
+ // Positive cases: Select one or no rows
+ Seq("id = 0", "id == 0", "id <= 0", "id < 1", "id IS NULL").foreach {
expr =>
+ filterPushDownBenchmark(1024 * 1024 * 1, 20, expr)
+ }
+
+ // Negative cases: Select all rows which means the predicate is always
true.
+ Seq("id > -1", "id != -1", "id IS NOT NULL").foreach { expr =>
+ filterPushDownBenchmark(1024 * 1024 * 1, 20, expr)
+ }
```
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