Related to TEIID-5932, a query with multiple lateral joins and a group by is optimized incorrectly. Altering the unit test query to:

SELECT xt.event_id, count(*) FROM tbl AS d, 
    TABLE (select d.event_id from tbl limit 1) xt
      LEFT JOIN TABLE (select tbl.str as some_col from tbl where str = 'a' || d.str) xt2
      ON xt.event_id = -1
group by xt.event_id

Results in a processing error because the initial pushdown for tbl only selects count star and does not select tbl.str.