github-actions[bot] commented on code in PR #68648:
URL: https://github.com/apache/doris/pull/68648#discussion_r4231099540
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fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/UpdateMvByPartitionCommand.java:
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@@ -130,17 +142,69 @@ private static List<String>
constructPartsForMv(Set<String> partitionNames) {
return Lists.newArrayList(partitionNames);
}
+ /**
+ * The predicate every base table of the MV definition is read through.
+ *
+ * <p>A table the caller scopes is read from exactly the base partitions
it named. Those are the ones
+ * the refresh is about to record as this MV partition's, and the read is
what has to match the record:
+ * reading the MV partition's own key range instead also reads base
partitions no snapshot describes,
+ * and a later silent change to one of them -- dropped, with the base
partition set back to what it
+ * was -- leaves the rows it put in this MV partition behind while the
partition is still judged
+ * synchronized, so the transparent rewrite serves them and no refresh
plans it again.
+ *
+ * <p>Every other table keeps the MV partition's own key range, which is
what the tables the caller
+ * does not scope were always read through. Scoped tables are olap ones;
the partition names are
+ * looked up on one, see the caller.
+ */
private static Map<TableIf, Set<Expression>>
constructTableWithPredicates(MTMV mv,
- Set<String> partitionNames, Map<TableIf, String> tableWithPartKey)
throws AnalysisException {
- Set<PartitionItem> items = Sets.newHashSet();
+ Set<String> partitionNames, Map<TableIf, String> tableWithPartKey,
+ Map<BaseTableInfo, Set<String>> readableBasePartitions) throws
AnalysisException {
+ Set<PartitionItem> mvItems = Sets.newHashSet();
for (String partitionName : partitionNames) {
- PartitionItem partitionItem =
mv.getPartitionItemOrAnalysisException(partitionName);
- items.add(partitionItem);
+ mvItems.add(mv.getPartitionItemOrAnalysisException(partitionName));
}
ImmutableMap.Builder<TableIf, Set<Expression>> builder = new
ImmutableMap.Builder<>();
- tableWithPartKey.forEach((table, colName) ->
- builder.put(table, constructPredicates(items, colName))
- );
+ for (Map.Entry<TableIf, String> entry : tableWithPartKey.entrySet()) {
+ TableIf table = entry.getKey();
+ String colName = entry.getValue();
+ Set<String> readable = readableBasePartitions == null ? null
+ : readableBasePartitions.get(new BaseTableInfo(table));
+ if (readable == null) {
+ builder.put(table, constructPredicates(mvItems, colName));
+ continue;
+ }
+ OlapTable olapTable = (OlapTable) table;
+ Set<PartitionItem> items = Sets.newHashSet();
+ for (String partitionName : readable) {
+
items.add(olapTable.getPartitionItemOrAnalysisException(partitionName));
+ }
+ if (items.stream().anyMatch(PartitionItem::isDefaultPartition)) {
+ // One of the partitions this MV partition is recorded with is
a list partitioned table's
+ // default partition, which takes the rows no other partition
of it claims. Those rows are
+ // the ones the MV partition's own key range names, wherever
the base table put them, and a
+ // partition of the MV takes them by that key rather than by
the partition they were placed
+ // in. So a table whose mapped partitions include one is read
the way an unscoped one is:
+ // the MV partition's key range, at the partition column's own
type. Which of the rows that
+ // range reaches sit in an explicit partition and which in the
default one is not something a
+ // predicate on the partition columns can say -- ADD PARTITION
claims a key without moving the
+ // rows a default partition already holds under it -- so this
table is not scoped at all, and
+ // the mapping is kept whole for it for the same reason: see
+ // MTMVRelatedPartitionDescSyncLimitGenerator, which leaves
such a table out of the window.
+ // The mapping names the default partition in every MV
partition that reads the table, so this
+ // is reached for each of them and not only for the one the
sentinel key maps to.
+ builder.put(table, constructPredicates(mvItems, colName,
+ Optional.of(partitionColumnType(olapTable, colName))));
+ continue;
+ }
+ if (readable.isEmpty()) {
Review Comment:
[P2] Retry alignment when an MV partition no longer matches the base
mapping. A legal `ADD PARTITION` can occur after
`MTMVTask.syncPartitionsIfNeeded` releases its base locks but before
`buildRefreshContext` recomputes descriptors. For `LIST(d,k)` with populated
`p1=((1,1))` and an MV partition `{1}`, adding `p12=((1,2),(2,2))` merges the
current projection to `{1,2}` while the old MV partition remains `{1}`. Its
mapping is now empty, so this `FALSE` filter makes a successful COMPLETE
refresh overwrite the populated MV partition with no rows. Direct reads of the
MV lose the committed `d=1` row until another refresh realigns. Detect an
unmatched MV descriptor and retry alignment instead of treating it as an
intentionally empty table mapping.
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