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https://issues.apache.org/jira/browse/CALCITE-3052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16836984#comment-16836984
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Anton Haidai commented on CALCITE-3052:
---------------------------------------
While trying hard, I still can't reproduce this error in "MaterializationTest",
but I can try to explain what is going on in terms of
MaterializedViewAggregateRule.rewriteView() method variables.
For this example, the query is "select count(*), max(grade), team from students
group by team"
*prevNode.getRowType() (same as "result" before the .aggregate() call based on
aggregateCalls):*
"agg_avg_grade", "agg_count", "agg_max_grade", "agg_metric", "agg_min_grade",
"faculty" ,"team"
*aggregateCalls:*
$SUM0, MAX
*result.getRowType() (after the .aggregate() call based on aggregateCalls):*
"team", "volume", "max_grade"
*queryAggregate.getRowType()*
"team", "EXPR$0", "EXPR$1", "EXPR$2", "EXPR$3", "EXPR$4"
*queryAggregate.getAggCallList()*
"AVG($1)", "COUNT()", "MAX($1)", "SUM($1)", "MIN($1)"
So there is an error when trying to make this for loop because the "result" has
less agg calls than "queryAggregate":
{code}
for (int i = 0; i < queryAggregate.getAggCallList().size(); i++) {
projects.add(
rexBuilder.makeInputRef(result, queryAggregate.getGroupCount() +
i));
}
{code}
> Error while applying rule MaterializedViewAggregateRule(Project-Aggregate):
> ArrayIndexOutOfBoundsException
> ----------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-3052
> URL: https://issues.apache.org/jira/browse/CALCITE-3052
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.19.0
> Reporter: Anton Haidai
> Priority: Major
>
> *Materialized views enabled:*
> # {{select avg(grade), count\(*), max(grade), sum(grade), min(grade), team
> from students group by team}}
> # {{select avg(grade), count\(*), max(grade), sum(grade), min(grade), team,
> faculty from students group by faculty, team}},
> *Query:*
> # {{select count\(*), team from students group by team}}
> *Error* (stacktrace is obtained using the current *master* branch:
> "247c7d4f76"):
> {noformat}
> Caused by: java.lang.ArrayIndexOutOfBoundsException: 2
> at
> com.google.common.collect.RegularImmutableList.get(RegularImmutableList.java:60)
> at org.apache.calcite.rex.RexBuilder.makeInputRef(RexBuilder.java:841)
> at
> org.apache.calcite.rel.rules.AbstractMaterializedViewRule$MaterializedViewAggregateRule.rewriteView(AbstractMaterializedViewRule.java:1507)
> at
> org.apache.calcite.rel.rules.AbstractMaterializedViewRule.perform(AbstractMaterializedViewRule.java:522)
> at
> org.apache.calcite.rel.rules.AbstractMaterializedViewRule$MaterializedViewProjectAggregateRule.onMatch(AbstractMaterializedViewRule.java:1776)
> at
> org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:208)
> ... 71 common frames omitted
> {noformat}
> Reproducible only if both Materialization views listed are enabled: any
> single one of these two could be successfully used with the query without any
> errors. Looks like is is reproducible when AbstractMaterializedViewRule is
> trying to rewrite one materialized view using the another materialized view.
> Currently, I'm trying to reproduce the issue in "MaterializationTest":
> without a success so far, I'll update the ticket if I'll find a working way
> to reproduce the issue in the test will be discovered.
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