github-actions[bot] commented on code in PR #68646:
URL: https://github.com/apache/doris/pull/68646#discussion_r4141872941
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fe/fe-core/src/main/java/org/apache/doris/mtmv/MTMVRelationManager.java:
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@@ -349,34 +357,118 @@ public void dropTable(Table table) {
// because a dropped table is the one change whose query is gone
beyond doubt. What the two record
// is the same state either way. Unlike a rename it stays an
invalidation: the table is gone for
// good, so the state is not something a later alter can make obsolete.
- processBaseTableChange(new BaseTableInfo(table), "The base table has
been deleted:", false);
+ processBaseTableChange(new BaseTableInfo(table), "The base table has
been deleted:", null);
}
/**
* update mtmv status to `SCHEMA_CHANGE`.
*
* @param isReplace
+ * @param queryJudgedColumns the names the alter gives the table or takes
away from it, which leave the
+ * judgement about each MV's state to that MV's
own query, or null when the
+ * alter is not one a query decides. The names
are carried rather than judged
+ * before the call because the judgement is
about them; see
+ * {@code AlterOp#queryJudgedColumnNames} for
which operations name one, and
+ * {@link #invalidateMvUnlessQueryHolds} for
what is asked about it. A rename
+ * of the base table names no column: it is left
to the record below, which
+ * says what the MV that keeps spelling the old
name needs to hear
*/
@Override
- public void alterTable(BaseTableInfo oldTableInfo, Optional<BaseTableInfo>
newTableInfo, boolean isReplace) {
+ public void alterTable(BaseTableInfo oldTableInfo, Optional<BaseTableInfo>
newTableInfo, boolean isReplace,
+ QueryJudgedChange queryJudgedChange) {
// when replace, need deal two table
if (isReplace) {
// REPLACE TABLE already invalidates the IVM baseline explicitly,
see Alter#processReplaceTable
- processBaseTableChange(newTableInfo.get(), "The base table has
been updated:", false);
+ processBaseTableChange(newTableInfo.get(), "The base table has
been updated:", null);
}
- boolean renamed = !isReplace && newTableInfo.isPresent()
- && !Objects.equals(oldTableInfo.getTableName(),
newTableInfo.get().getTableName());
- // A rename is the one change whose query check is skipped: the MV
query keeps spelling the old
- // name, so it is unanalyzable by construction, and the reason it
would be invalidated with --
- // "the query is no longer analyzable" -- says less than the message
this call records anyway.
- boolean checkQueryUsable = !renamed;
- processBaseTableChange(oldTableInfo, "The base table has been
updated:", checkQueryUsable);
+ processBaseTableChange(oldTableInfo, "The base table has been
updated:", queryJudgedChange);
}
/**
- * An MV's query is only as good as the base table schema it was analyzed
against. Re-analyzing the
- * MV query here (right after the alter was applied) is what detects a
changed column identity:
+ * Whether the query, as it is analysed now, reads a column of any of
these names, and reads it where
+ * the change can reach it.
+ *
+ * <p>There are two such places, and they are the two ways a name is the
change's to answer for. One is
+ * a column of the table the change is about: that is the column this
view's rows were computed from, and
+ * the names are matched case-insensitively because a name is what moves.
The other is a column the query
+ * reaches across a scope boundary -- the plan records those on the Apply
that stands for the subquery,
+ * whose correlation slots are the outer columns its right side reads --
because such a name is the
+ * scopes' to answer for rather than the query's: the nearest column to
the reference answers for it, so
+ * a column the change takes away from a scope inside leaves the name to
one outside, and a column it
+ * gives to a scope inside takes the name over, while the query goes on
producing the columns it always
+ * produced out of rows from somewhere else. A name reached with the
qualifier of another table inside
+ * the query's own scope is neither: no later change can move it, so one
to a column it does not name is
+ * one this view's rows do not depend on.
+ */
+ private static boolean reachesAnyColumnOf(Plan plan, BaseTableInfo
baseTableInfo, Set<String> columnNames) {
+ if (plan == null) {
+ // A query whose plan was not kept is one this cannot be answered
about, and "it does" is the
+ // answer that keeps the view safe.
+ return true;
+ }
+ Set<String> names = Sets.newTreeSet(String.CASE_INSENSITIVE_ORDER);
+ names.addAll(columnNames);
+ LineageInfo lineage = LineageInfoExtractor.extractLineageInfo(plan);
+ for (SetMultimap<?, Expression> byType :
lineage.getDirectLineageMap().values()) {
+ if (reachesAnyColumn(byType.values(), names, baseTableInfo)) {
+ return true;
+ }
+ }
+ // The dataset predicates once, not once per output column: the
per-output copy of them the lineage
+ // also offers holds the same expressions for every column the query
produces, and scanning it would
+ // visit each of them once per column.
+ if (reachesAnyColumn(lineage.getDatasetIndirectLineageMap().values(),
names, baseTableInfo)) {
+ return true;
+ }
+ return reachesAnyColumnAcrossScopes(plan, lineage, names,
baseTableInfo);
Review Comment:
[P1] Include IN-subquery outputs in the MV dependency check. An MV defined
as `SELECT o.id FROM outer_t o WHERE o.flag IN (SELECT flag FROM inner_t i)`
can refresh with outer `(id=1, flag=1)` and inner `(x=1)`: the unqualified
`flag` initially binds `o.flag`. After a light `ALTER TABLE inner_t ADD COLUMN
flag INT DEFAULT 0`, it binds `i.flag`, so the query returns no row, but this
check preserves the old MV row and leaves it NORMAL. In the analyzed plan that
changed binding is in `LogicalApply.right`'s Project; neither the
top-output/dataset lineage nor the post-ADD correlation slots inspect it.
Please account for Apply right-output dependencies (or compare bindings across
the schema change) before skipping invalidation.
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