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https://issues.apache.org/jira/browse/IGNITE-20164?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Maksim Zhuravkov reassigned IGNITE-20164:
-----------------------------------------
Assignee: Maksim Zhuravkov
> Sql. Incorrect propagation of RelCollation trait for Sort-based map/reduce
> aggregates.
> --------------------------------------------------------------------------------------
>
> Key: IGNITE-20164
> URL: https://issues.apache.org/jira/browse/IGNITE-20164
> Project: Ignite
> Issue Type: Bug
> Components: sql
> Affects Versions: 3.0.0-beta1
> Reporter: Maksim Zhuravkov
> Assignee: Maksim Zhuravkov
> Priority: Major
> Labels: ignite-3
>
> RelCollation propagation does not take into account remapping of group keys
> between MAP/REDUCE phases, hence causes errors in queries that are expected
> to use sort-based MAP/REDUCE - RelCollation uses the same keys on both
> phases. Example:
> {code:java}
> String[] rules = {
> "MapReduceHashAggregateConverterRule",
> "ColocatedHashAggregateConverterRule",
> "ColocatedSortAggregateConverterRule"
> };
> sql("CREATE TABLE testMe40 (a INTEGER, b INTEGER);");
> sql("INSERT INTO testMe40 VALUES (11, 2), (12, 2), (12, 3)");
> assertQuery("SELECT COUNT(a), COUNT(DISTINCT(b)) FROM testMe40")
> .disableRules(rules)
> .returns(3L, 2L)
> .check();
> {code}
> Plan:
> {code:java}
> IgniteProject(EXPR$0=[CAST($0):BIGINT NOT NULL], EXPR$1=[$1]),
> IgniteReduceSortAggregate(group=[{}], EXPR$0=[$SUM0($1)],
> EXPR$1=[COUNT($0)], collation=[[]]),
> IgniteMapSortAggregate(group=[{}], EXPR$0=[$SUM0($1)],
> EXPR$1=[COUNT($0)], collation=[[]]),
> IgniteReduceSortAggregate(group=[{1}], EXPR$0=[COUNT($0)],
> collation=[[1]]), <---- HERE
> IgniteExchange(distribution=[single]),
> IgniteMapSortAggregate(group=[{1}], EXPR$0=[COUNT($0)],
> collation=[[1]]),
> IgniteSort(sort0=[$1], dir0=[ASC]),
> IgniteTableScan(table=[[PUBLIC, TESTME40]],
> requiredColumns=[{1, 2}]),
> {code}
> Error:
> {code:java}
> Caused by: java.lang.ClassCastException: class java.util.ArrayList cannot be
> cast to class java.lang.Comparable (java.util.ArrayList and
> java.lang.Comparable are in module java.base of loader 'bootstrap')
> at
> org.apache.ignite.internal.sql.engine.exec.exp.ExpressionFactoryImpl.compare(ExpressionFactoryImpl.java:247)
> at
> org.apache.ignite.internal.sql.engine.exec.exp.ExpressionFactoryImpl.lambda$comparator$0(ExpressionFactoryImpl.java:178)
> at
> java.base/java.util.Map$Entry.lambda$comparingByKey$6d558cbf$1(Map.java:539)
> at
> java.base/java.util.PriorityQueue.siftUpUsingComparator(PriorityQueue.java:675)
> at java.base/java.util.PriorityQueue.siftUp(PriorityQueue.java:652)
> at java.base/java.util.PriorityQueue.offer(PriorityQueue.java:345)
> at
> org.apache.ignite.internal.sql.engine.exec.rel.Inbox.pushOrdered(Inbox.java:235)
> at
> org.apache.ignite.internal.sql.engine.exec.rel.Inbox.push(Inbox.java:188)
> at
> org.apache.ignite.internal.sql.engine.exec.rel.Inbox.onBatchReceived(Inbox.java:168)
> at
> org.apache.ignite.internal.sql.engine.exec.ExchangeServiceImpl.onMessage(ExchangeServiceImpl.java:184)
> ... 7 more
> {code}
> The query below works because position of column b does not change after MAP
> phase.
> {code:java}
> String[] rules = {
> "MapReduceHashAggregateConverterRule",
> "ColocatedHashAggregateConverterRule",
> "ColocatedSortAggregateConverterRule"
> };
> sql("CREATE TABLE testMe40 (a INTEGER, b INTEGER);");
> sql("INSERT INTO testMe40 VALUES (11, 2), (12, 2), (12, 3)");
> assertQuery("SELECT COUNT(a), COUNT(DISTINCT(b)) FROM testMe40")
> .disableRules(rules)
> .returns(3L, 2L)
> .check();
> {code}
> Plan:
> {code:java}
> IgniteProject(EXPR$0=[$0], EXPR$1=[CAST($1):BIGINT NOT NULL]),
> IgniteReduceSortAggregate(group=[{}], EXPR$0=[COUNT($0)],
> EXPR$1=[$SUM0($1)], collation=[[]]),
> IgniteMapSortAggregate(group=[{}], EXPR$0=[COUNT($0)],
> EXPR$1=[$SUM0($1)], collation=[[]]),
> IgniteReduceSortAggregate(group=[{0}], EXPR$1=[COUNT($1)],
> collation=[[0]]),
> IgniteExchange(distribution=[single]),
> IgniteMapSortAggregate(group=[{0}], EXPR$1=[COUNT($1)],
> collation=[[0]]),
> IgniteSort(sort0=[$0], dir0=[ASC]),
> IgniteTableScan(table=[[PUBLIC, TESTME40]], projects=[[$t1,
> $t0]], requiredColumns=[{1, 2}]),
> {code}
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