kasakrisz commented on code in PR #5505:
URL: https://github.com/apache/hive/pull/5505#discussion_r1922466623
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ql/src/java/org/apache/hadoop/hive/ql/parse/CalcitePlanner.java:
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@@ -995,12 +995,6 @@ private static String canHandleQbForCbo(QueryProperties
queryProperties,
HiveConf conf, boolean topLevelQB) {
List<String> reasons = new ArrayList<>();
// Not ok to run CBO, build error message.
- if (queryProperties.hasClusterBy()) {
- reasons.add("has cluster by");
- }
- if (queryProperties.hasDistributeBy()) {
- reasons.add("has distribute by");
- }
if (queryProperties.hasSortBy() && queryProperties.hasLimit()) {
reasons.add("has sort by with limit");
}
Review Comment:
It is not implemented at all in CBO. Currently `Order by limit` is
represented by `HiveSortLimit` and `Sort/Distribute/Clustered by` is
represented by `HiveSortExchage`. To represent `Sort by limit` we need to
combine these two RelNodes
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