Support CONCEPTQL_AVOID_CTES=true to avoid creating CTEs where possible #228
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CTEs are used in 4 places on PostgreSQL (1 additional place on Impala,
which I didn't modify):
Unfortunately, this approach does not help performance in the tests
when enabled:
co_reported: 15.2 seconds -> 16.6 seconds
occurrence: 50 seconds -> 152 seconds
recall: 1.4 seconds -> 2.5 seconds