@Ganesh
Ganesh, nope, as there were many different queries executed in the whole cluster, then these exec IDs don’t have to correspond to each other (assuming that you were talking about a case where QC runs a SQL which the gets executed using PX across multiple nodes – in this case, for that query only, the sql_exec_id is the same for all PX slaves, regardless of on which instance the slaves happen to run). So if I picked only one SQL statement executed with PX I would see what you mentioned, but in the above case there were many different SQLs executed over time.
If you don’t agree, you’re welcome to post a test case (with output) which proves me wrong ;-)