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Posted to issues@calcite.apache.org by "Julian Hyde (JIRA)" <ji...@apache.org> on 2014/09/09 02:03:29 UTC
[jira] [Assigned] (OPTIQ-401) New SqlExplainLevel
ALL_ATTRIBUTES_COST_IF_AVAILABLE
[ https://issues.apache.org/jira/browse/OPTIQ-401?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Julian Hyde reassigned OPTIQ-401:
---------------------------------
Assignee: Ashutosh Chauhan (was: Julian Hyde)
> New SqlExplainLevel ALL_ATTRIBUTES_COST_IF_AVAILABLE
> ----------------------------------------------------
>
> Key: OPTIQ-401
> URL: https://issues.apache.org/jira/browse/OPTIQ-401
> Project: Optiq
> Issue Type: Improvement
> Reporter: Ashutosh Chauhan
> Assignee: Ashutosh Chauhan
>
> We want to use ALL_ATTRIBUTES because it prints cost, which is helpful in debugging. But in certain systems (eg Hive) stats are fetched only on demand. So, its possible that stats are not fetched and are thus not available for few columns because they were not referred in query. Now, if you do {{RelOptUtil.toString(optiqPlan, SqlExplainLevel.ALL_ATTRIBUTES)}} It results in following stack trace:
> {code}
> at com.sun.proxy.$Proxy18.getRowCount(Unknown Source)
> at org.eigenbase.rel.metadata.RelMetadataQuery.getRowCount(RelMetadataQuery.java:95)
> at org.eigenbase.rel.RelWriterImpl.explain_(RelWriterImpl.java:103)
> at org.eigenbase.rel.RelWriterImpl.done(RelWriterImpl.java:171)
> at org.eigenbase.rel.AbstractRelNode.explain(AbstractRelNode.java:280)
> at org.eigenbase.relopt.RelOptUtil.toString(RelOptUtil.java:1694)
> Caused by: java.lang.AssertionError
> at org.eigenbase.rel.metadata.RelMetadataQuery.isNonNegative(RelMetadataQuery.java:381)
> at org.eigenbase.rel.metadata.RelMetadataQuery.validateResult(RelMetadataQuery.java:400)
> at org.eigenbase.rel.metadata.RelMetadataQuery.getRowCount(RelMetadataQuery.java:96)
> at org.eigenbase.rel.metadata.RelMdRowCount.getRowCount(RelMdRowCount.java:61)
> {code}
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