yujun777 commented on code in PR #68646:
URL: https://github.com/apache/doris/pull/68646#discussion_r4143668516
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fe/fe-core/src/main/java/org/apache/doris/mtmv/MTMVRelationManager.java:
##########
@@ -349,34 +359,167 @@ 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 places 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. 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;
+ }
+ if (reachesAnyColumnOfASubquery(plan, names, baseTableInfo)) {
+ return true;
+ }
+ return reachesAnyColumnAcrossScopes(plan, lineage, names,
baseTableInfo);
+ }
+
+ /** Whether this slot is a column of this table, through whatever views
stand between the two. */
+ private static boolean isColumnOf(Slot slot, BaseTableInfo baseTableInfo) {
+ if (!(slot instanceof SlotReference)) {
+ return false;
+ }
+ return ((SlotReference) slot).getOriginalTable()
+ .map(table -> new BaseTableInfo(table).equals(baseTableInfo))
+ .orElse(false);
+ }
+
+ /**
+ * Whether a name the change is about is answered for inside a subquery,
out of that subquery's own
+ * scope.
+ *
+ * <p>This is the one place a name can move without any column the view
produces depending on it: the
+ * scope of a subquery is internal, so which column answers for a name
there changes what the query
+ * returns -- a row, or none -- while every column of the view stays the
one it was. The lineage of the
+ * view's columns does not reach it, so the scope the subquery became is
read here, expression by
+ * expression, the way the lineage is read for the view's own.
+ *
+ * <p>Two things are read. One is a value the subquery itself names -- an
expression of its own under one
+ * of these names, rather than a column of a table -- because that is what
a name the change takes away
+ * falls back to, and it decides the rows whether the subquery is a
predicate or a value. The other is a
+ * column of the table the change is about, which decides the rows only
when the subquery's output is
+ * one the query reads: an EXISTS tests the rows of its subquery and not
what it projects, so a name it
+ * projects and never compares is one this view's rows do not depend on.
+ */
+ private static boolean reachesAnyColumnOfASubquery(Plan plan, Set<String>
names,
+ BaseTableInfo baseTableInfo) {
+ for (LogicalApply<?, ?> apply :
plan.<LogicalApply>collectToList(LogicalApply.class::isInstance)) {
+ boolean outputDecidesRows = !((LogicalApply<?, ?>)
apply).isExist();
+ for (Plan node :
apply.right().<Plan>collectToList(Plan.class::isInstance)) {
+ for (Expression expression : node.getExpressions()) {
+ if (isNamedByTheSubquery(expression, names)
Review Comment:
Fixed in d39e12d51aa. You are right, and measured: the MV holds `id=1` and a
light `ADD COLUMN flag` on the inner table left it SCHEMA_CHANGE, for a
subquery whose own `flag` nothing reads.
The read now matches a value the subquery answers for itself only where an
expression in the subquery actually reads it -- the slot is a value the
subquery produced rather than a column of a table -- which is the distinction
between this and the `1 AS flag` thread: there the group by and the having read
that name after the drop, here the projected `1 AS flag` is only named. Pinned
as `named_not_read_*` in the drop suite, and the earlier `alias_*` case still
invalidates, so the side that matters is unchanged.
##########
fe/fe-core/src/main/java/org/apache/doris/alter/Alter.java:
##########
@@ -373,8 +374,30 @@ private boolean
processAlterOlapTableInternal(List<AlterOp> alterOps, OlapTable
throw new DdlException("Invalid alter operations: " +
currentAlterOps);
}
if (needChangeMTMVState(alterOps)) {
- Env.getCurrentEnv().getMtmvService()
- .alterTable(oldBaseTableInfo, newBaseTableInfo,
currentAlterOps.hasReplaceTableOp());
+ // Which columns an operation's effect on a view turns on is the
operation's to say, see
+ // AlterOp#queryJudgedColumnNames, and every clause of the alter
has to name them: a batch that
+ // mixes a dropped column with a type change is decided by neither
-- no query says anything
+ // about a type change -- and stays invalidated the way it was
before the queries were asked at
+ // all. Each of them also has to have reached the table. A schema
change that is not a light one
+ // is applied by a job, which may not have run where this hook
runs: the table still holds the
+ // column the change is about, every query still analyses against
it, and an invalidation
+ // decided on that answer would be about the table from before the
change. What is asked is
+ // whether the change has reached the table, which is the same
fact the re-analysis reads, so
+ // the two answers cannot disagree.
+ boolean judgedByQuery = alterOps.stream().allMatch(op ->
!op.queryJudgedColumnNames().isEmpty()
+ && op.hasReachedTheTable(olapTable));
Review Comment:
Fixed in d39e12d51aa. The reached check is read under the table's read lock
now, in one place (`Alter#haveReachedTheTable`), so a column map being rebuilt
by another statement's light change cannot be read mid rebuild; the analysis
and the journal waits stay outside the lock, as you say.
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