[introspection] Query failure when query parallelism = 1 #1585
Description
When setting query_parallelism = 1 we get a failure during execution with the following query:
RESTATE_ADMIN__QUERY_ENGINE__QUERY_PARALLELISM=1 \
RESTATE_WORKER__BOOTSTRAP_NUM_PARTITIONS=4 \
./target/debug/restate-server --wipe all
./target/debug/restate sql
'SELECT ss.id FROM sys_invocation_status ss LEFT JOIN sys_invocation_state sis ON ss.id = sis.id'
This however does not happen for any value >= 2.