[
https://issues.apache.org/jira/browse/CALCITE-1775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16001334#comment-16001334
]
slim bouguerra commented on CALCITE-1775:
-----------------------------------------
cc [~jcamachorodriguez]
> Druid adapter: "GROUP BY ()" on empty relation should return 1 row
> ------------------------------------------------------------------
>
> Key: CALCITE-1775
> URL: https://issues.apache.org/jira/browse/CALCITE-1775
> Project: Calcite
> Issue Type: Bug
> Components: druid
> Reporter: Julian Hyde
> Assignee: Julian Hyde
>
> A "GROUP BY ()" query on an empty relation should return 1 row, but currently
> returns 0 rows.
> Test case in {{DruidAdapterIT}}:
> {code}
> @Test public void testSelectCountEmpty() {
> sql("select count(*) as c from \"foodmart\" where \"product_id\" < 0")
> .returnsUnordered("C=0");
> sql("select count(*) as c from \"foodmart\" where 1 < 0")
> .returnsUnordered("C=0");
> }
> {code}
> Both queries should return one row. The first returns 0 rows; the second
> query throws
> {noformat}
> java.lang.AssertionError: cannot translate filter: false
> at
> org.apache.calcite.adapter.druid.DruidQuery$Translator.translateFilter(DruidQuery.java:1067)
> at
> org.apache.calcite.adapter.druid.DruidQuery$Translator.access$000(DruidQuery.java:933)
> at
> org.apache.calcite.adapter.druid.DruidQuery.getQuery(DruidQuery.java:497)
> at
> org.apache.calcite.adapter.druid.DruidQuery.deriveQuerySpec(DruidQuery.java:470)
> at
> org.apache.calcite.adapter.druid.DruidQuery.getQuerySpec(DruidQuery.java:414)
> at
> org.apache.calcite.adapter.druid.DruidQuery.deriveRowType(DruidQuery.java:308)
> at
> org.apache.calcite.rel.AbstractRelNode.getRowType(AbstractRelNode.java:224)
> at
> org.apache.calcite.plan.volcano.VolcanoPlanner.register(VolcanoPlanner.java:857)
> at
> org.apache.calcite.plan.volcano.VolcanoPlanner.ensureRegistered(VolcanoPlanner.java:883)
> at
> org.apache.calcite.plan.volcano.VolcanoPlanner.ensureRegistered(VolcanoPlanner.java:1769)
> at
> org.apache.calcite.plan.volcano.VolcanoRuleCall.transformTo(VolcanoRuleCall.java:135)
> at
> org.apache.calcite.plan.RelOptRuleCall.transformTo(RelOptRuleCall.java:225)
> at
> org.apache.calcite.adapter.druid.DruidRules$DruidFilterRule.onMatch(DruidRules.java:228)
> at
> org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:211)
> {noformat}
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
