kasakrisz commented on a change in pull request #2663:
URL: https://github.com/apache/hive/pull/2663#discussion_r719283577
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File path: ql/src/test/queries/clientpositive/materialized_view_parquet.q
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@@ -189,8 +189,10 @@ alter materialized view mv1_parquet_n2 rebuild;
alter materialized view mv1_parquet_n2 rebuild;
explain cbo
-select name from emps_parquet_n3 group by name;
+select name, sum(empid) from emps_parquet_n3 group by name;
Review comment:
The original test was actually hiding that projecting `ROW__ID.writeId`
in case of insert-only tables always return `NULL`. However incremental MV
rebuild was used and because of the `NULL` writeIds it did not inserted any
records so the view data remained in an outdated state but the view was marked
up to date by the system.
By adding the aggregation `sum(empid)` and the extra query after dropping
the view the difference in the results showed up.
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