hantangwangd commented on code in PR #12201:
URL: https://github.com/apache/iceberg/pull/12201#discussion_r1947986708
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core/src/main/java/org/apache/iceberg/util/TableScanUtil.java:
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@@ -236,6 +236,9 @@ public static long adjustSplitSize(long scanSize, int
parallelism, long splitSiz
// use the configured split size if it produces at least one split per slot
// otherwise, adjust the split size to target parallelism with a
reasonable minimum
// increasing the split size may cause expensive spills and is not done
automatically
+ if (splitSize <= 0) {
Review Comment:
When querying in Spark, the `adjustSplitSize(...)` is invoked earlier than
`TableScanUtil.planTaskGroups(...)` as follows, so the illegal split size will
be handle in `adjustSplitSize(...)` first and meet this problem. I believe in
other engine, if they have the logic to adjust the split size, this would be
the case as well.
```
TableScanUtil.planTaskGroups(
CloseableIterable.withNoopClose(tasks()),
adjustSplitSize(tasks(), scan.targetSplitSize()),
scan.splitLookback(),
scan.splitOpenFileCost());
```
According to my understanding of what you mean, we should simply add a
`checkArgument` for splitSize in `adjustSplitSize(...)` to throw an error for
illegal value, is that right?
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