gianm opened a new issue #6433: SQL: Bizarre error when computing min(string) URL: https://github.com/apache/incubator-druid/issues/6433 Try: `select min('foo') from tbl`. The error looks like `Error while applying rule DruidQueryRule(AGGREGATE)` and has a trace: ``` Caused by: io.druid.java.util.common.ISE: Cannot create aggregator factory for type[STRING] at io.druid.sql.calcite.aggregation.builtin.MinSqlAggregator.createMinAggregatorFactory(MinSqlAggregator.java:116) ~[druid-sql-0.12.3-iap6.jar:0.12.3-iap6] at io.druid.sql.calcite.aggregation.builtin.MinSqlAggregator.toDruidAggregation(MinSqlAggregator.java:97) ~[druid-sql-0.12.3-iap6.jar:0.12.3-iap6] at io.druid.sql.calcite.rule.GroupByRules.translateAggregateCall(GroupByRules.java:122) ~[druid-sql-0.12.3-iap6.jar:0.12.3-iap6] at io.druid.sql.calcite.rel.DruidQuery.computeAggregations(DruidQuery.java:490) ~[druid-sql-0.12.3-iap6.jar:0.12.3-iap6] at io.druid.sql.calcite.rel.DruidQuery.computeGrouping(DruidQuery.java:269) ~[druid-sql-0.12.3-iap6.jar:0.12.3-iap6] at io.druid.sql.calcite.rel.DruidQuery.<init>(DruidQuery.java:145) ~[druid-sql-0.12.3-iap6.jar:0.12.3-iap6] at io.druid.sql.calcite.rel.PartialDruidQuery.build(PartialDruidQuery.java:285) ~[druid-sql-0.12.3-iap6.jar:0.12.3-iap6] at io.druid.sql.calcite.rel.DruidQueryRel.toDruidQuery(DruidQueryRel.java:98) ~[druid-sql-0.12.3-iap6.jar:0.12.3-iap6] at io.druid.sql.calcite.rel.DruidQueryRel.toDruidQueryForExplaining(DruidQueryRel.java:110) ~[druid-sql-0.12.3-iap6.jar:0.12.3-iap6] at io.druid.sql.calcite.rel.DruidRel.isValidDruidQuery(DruidRel.java:70) ~[druid-sql-0.12.3-iap6.jar:0.12.3-iap6] at io.druid.sql.calcite.rule.DruidRules$DruidQueryRule.onMatch(DruidRules.java:137) ~[druid-sql-0.12.3-iap6.jar:0.12.3-iap6] at org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:212) ~[calcite-core-1.15.0.jar:1.15.0] ... 77 more ```
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