zabetak commented on a change in pull request #2991:
URL: https://github.com/apache/hive/pull/2991#discussion_r801604148
##########
File path: ql/src/test/queries/clientpositive/stats_part_multi_insert.q
##########
@@ -0,0 +1,18 @@
+-- Test multi inserting to the same partition
+
+create table source(p int, key int,value string);
+insert into source(p, key, value) values (101,42,'string42');
+
+create table stats_part(key int,value string) partitioned by (p int);
+
+from source
+insert into stats_part select key, value, p
+insert into stats_part select key, value, p;
+
+select p, key, value from stats_part;
+desc formatted stats_part;
+select count(*) from stats_part;
Review comment:
To keep the test functional even if the default value of
`hive.compute.query.using.stats` changes in the future I would add an explicit
set to true just before the select query.
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/stats/BasicStatsTask.java
##########
@@ -512,6 +513,8 @@ private String toString(Map<String, String> parameters) {
if (dpPartSpecs != null) {
// load the list of DP partitions and return the list of partition
specs
list.addAll(dpPartSpecs);
+ // Reload partition metadata because another BasicStatsTask instance
may have updated the stats.
+ list = db.getPartitionsByNames(table,
list.stream().map(Partition::getName).collect(Collectors.toList()));
Review comment:
Given that we are dealing with a correctness problem here, I would be
inclined to commit this fix as is right now and treat possible improvements if
any in a follow up keeping in mind that the performance overhead of
`getPartitionByNames` is not measured.
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/stats/BasicStatsTask.java
##########
@@ -512,6 +513,8 @@ private String toString(Map<String, String> parameters) {
if (dpPartSpecs != null) {
// load the list of DP partitions and return the list of partition
specs
list.addAll(dpPartSpecs);
+ // Reload partition metadata because another BasicStatsTask instance
may have updated the stats.
+ list = db.getPartitionsByNames(table,
list.stream().map(Partition::getName).collect(Collectors.toList()));
Review comment:
Maybe it would be slightly more readable like below:
```suggestion
// Reload partition metadata because another BasicStatsTask
instance may have updated the stats.
List<String> partNames =
dpPartSpecs.stream().map(Partition::getName).collect(Collectors.toList());
list.addAll(db.getPartitionsByNames(table, partNames));
```
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