[DRILL-5880] java.sql.SQLException: UNSUPPORTED_OPERATION ERROR: This query cannot be planned possibly due to either a cartesian join or an inequality join

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.11.0
• Fix Version/s: 1.13.0
• Component/s: Execution - Relational Operators
• Assignee: Vova Vysotskyi
• Reporter: Prasad Nagaraj Subramanya
• Created: 16/Oct/17 21:33
• Updated: 19/Jan/18 11:11
• Resolved: 19/Jan/18 11:11

Description

Consider the below query

select region.sales_region as c0, region_1.sales_region as c1, sum(sales_fact_1997.unit_sales) as m0 from region as region, store as store, sales_fact_1997 as sales_fact_1997, region as region_1, customer as customer where sales_fact_1997.store_id = store.store_id and store.region_id = region.region_id and region.sales_region = 'South West' and sales_fact_1997.customer_id = customer.customer_id and customer.customer_region_id = region_1.region_id and region_1.sales_region = 'South West' group by region.sales_region, region_1.sales_region

The query fails with the following error-

(org.apache.drill.exec.work.foreman.UnsupportedRelOperatorException) This query cannot be planned possibly due to either a cartesian join or an inequality join
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToPrel():437
    org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.getPlan():169
    org.apache.drill.exec.planner.sql.DrillSqlWorker.getQueryPlan():131
    org.apache.drill.exec.planner.sql.DrillSqlWorker.getPlan():79
    org.apache.drill.exec.work.foreman.Foreman.runSQL():991
    org.apache.drill.exec.work.foreman.Foreman.run():276
    java.util.concurrent.ThreadPoolExecutor.runWorker():1145
    java.util.concurrent.ThreadPoolExecutor$Worker.run():615
    java.lang.Thread.run():744

This is a regression. It worked with drill 1.10.0

Having a single alias of the table region in the above query works fine.