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https://issues.apache.org/jira/browse/CALCITE-1292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15331217#comment-15331217
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Michael Spector commented on CALCITE-1292:
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PR: https://github.com/apache/calcite/pull/249
> Druid metadata query is very slow
> ---------------------------------
>
> Key: CALCITE-1292
> URL: https://issues.apache.org/jira/browse/CALCITE-1292
> Project: Calcite
> Issue Type: Bug
> Components: druid
> Affects Versions: 1.8.0
> Reporter: Michael Spector
> Assignee: Julian Hyde
>
> Steps to reproduce:
> {code:none}
> sqlline> !connect
> jdbc:calcite:schemaFactory=org.apache.calcite.adapter.druid.DruidSchemaFactory;schema.url=http://localhost:8082;schema.coordinatorUrl=http://localhost:8081
> sqlline> !tables
> {code}
> This query runs for very long time if data source contains a lot of data.
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