okumin commented on code in PR #4363:
URL: https://github.com/apache/hive/pull/4363#discussion_r1207584190
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ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java:
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@@ -1440,47 +1443,78 @@ public String toString() {
}
}
- private List<Task<?>> toRealRootTasks(List<CTEClause> execution) {
- List<Task<?>> cteRoots = new ArrayList<>();
- List<Task<?>> cteLeafs = new ArrayList<>();
- List<Task<?>> curTopRoots = null;
Review Comment:
This looks like the root cause. In [the case I put in the
ticket](https://issues.apache.org/jira/browse/HIVE-24606), there are the
following dependencies.
- `<root> -> a1`
- `<root> -> x`
- `<root> -> a2`
- `a2 -> a1`
But the old implementation tries to traverse CTEs in order of `a1` -> `x` ->
`a2` -> `<root>`, following the appearance in the AST.
As a result, when it visits `a2`, the information of `a1` has gone and it
fails to link `a2` with `a1`.
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