Union all cohorts in a single cohort table
unionCohorts(x, cohortDefinitionId = 1L)union_cohorts(x, cohort_definition_id = 1L)
A lazy query that when executed will resolve to a new cohort table with one cohort_definition_id resulting from the union of all cohorts in the original cohort table
A tbl reference to a cohort table
A number to use for the new cohort_definition_id