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https://issues.apache.org/jira/browse/IGNITE-18363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17646000#comment-17646000
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Taras Ledkov commented on IGNITE-18363:
---------------------------------------
[~alex_pl], the patch is OK with me.
> Calcite engine. Limit with offset can return negative estimated rows count
> --------------------------------------------------------------------------
>
> Key: IGNITE-18363
> URL: https://issues.apache.org/jira/browse/IGNITE-18363
> Project: Ignite
> Issue Type: Bug
> Reporter: Aleksey Plekhanov
> Assignee: Aleksey Plekhanov
> Priority: Major
> Labels: calcite, calcite2-required, calcite3-required
> Fix For: 2.15
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Limit with offset can return negative estimated rows count, this will throw
> an assertion error if limit is used as input of another relational operator.
> For example:
> {code:java}
> CREATE TABLE t(id INT);
> INSERT INTO t VALUES (1), (2), (3);
> SELECT (SELECT id FROM t ORDER BY id LIMIT 1 OFFSET 10); {code}
> Throws:
> {noformat}
> java.lang.AssertionError: null
> at
> org.apache.calcite.rel.metadata.RelMdUtil.isNonNegative(RelMdUtil.java:988)
> ~[calcite-core-1.32.0.jar:1.32.0]
> at
> org.apache.calcite.rel.metadata.RelMdUtil.validateResult(RelMdUtil.java:977)
> ~[calcite-core-1.32.0.jar:1.32.0]
> at
> org.apache.calcite.rel.metadata.RelMetadataQuery.getRowCount(RelMetadataQuery.java:259)
> ~[calcite-core-1.32.0.jar:1.32.0]
> at
> org.apache.calcite.rel.metadata.RelMdRowCount.getRowCount(RelMdRowCount.java:73)
> ~[calcite-core-1.32.0.jar:1.32.0]
> at
> org.apache.calcite.rel.metadata.janino.GeneratedMetadata_RowCountHandler.getRowCount_$(Unknown
> Source) ~[?:?]
> at
> org.apache.calcite.rel.metadata.janino.GeneratedMetadata_RowCountHandler.getRowCount(Unknown
> Source) ~[?:?]
> at
> org.apache.calcite.rel.metadata.RelMetadataQuery.getRowCount(RelMetadataQuery.java:258)
> ~[calcite-core-1.32.0.jar:1.32.0]
> at
> org.apache.ignite.internal.processors.query.calcite.rel.IgniteAggregate.computeSelfCostHash(IgniteAggregate.java:94)
> ~[classes/:?]{noformat}
>
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