andygrove commented on code in PR #7094:
URL: https://github.com/apache/datafusion-comet/pull/7094#discussion_r4308774392
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spark/src/test/scala/org/apache/comet/exec/CometExecSuite.scala:
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@@ -3483,6 +3484,36 @@ class CometExecSuite extends CometTestBase {
}
}
+ test("native scan loads the next file's metadata while it reads the current
file") {
+ withTempPath { dir =>
+ val path = dir.getCanonicalPath
+ spark.range(0, 4000, 1, 4).toDF("id").write.parquet(path)
+ // `None` leaves the config unset: the prefetch is opt-in.
+ Seq(Some(true), Some(false), None).foreach { prefetch =>
Review Comment:
Fixed. `CometExecIterator` always sends the value, so the unset run was a
duplicate of `false`. The test runs `true` and `false` only, which saves a full
query run. (6be7a15a49)
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