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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