We run a postgresql 14 with citus_columnar in version 11.1. Scenario 1: select on 3 tables, where 2 two tables are partitioned and "using columnar". This works pefectly
Scenario 2: the same select, but with create table as. Here comes an error: "cannot modify commandid in active snapshot during a parallel operation"
Scenario 3: the same as scenario 2, but the tables weren't defined with "using columnar". This works again.
What leads to the error-message in Scenario 2 ? All 3 scenarios have Plans with parallel-workers.
We didn't expect, that the parallel select in the ctas-statement would run into an error with citus.
