Marc-André Bombeck
83b6ce4b15
test: pin the dashboard summary read shapes against a plan regression
...
Neither read is a bug a behavioural test can see: both shapes return the
right rows, and only the plan differs. So the guards split by what each
can actually answer.
The unit guard asserts on the SQL the readers build, with comments
stripped so it matches the query text and never the prose describing it:
no DISTINCT ON on this path, a LATERAL driven from an unnested type list
with a LIMIT on the per-type branch, a bound type predicate on the rollup
read sitting alongside the user and granularity filters, and the route
still calling the shared readers rather than growing a second copy. Four
of its five cases fail against the pre-change SQL.
The integration companion runs the shipped readers and the pre-change SQL
side by side over one fixture on the real Postgres and requires identical
rows. The fixture carries the cases the rewrite could have broken: a type
whose only rows are tombstoned, a type with no rows, a type whose newest
row is a tombstone over a surviving one, and coarser rollup granularities
the DAY read must ignore. Dropping the soft-delete filter or shortening
the type list makes both cases fail.
Plan assertions are deliberately not in the integration file: a
testcontainer fixture is too small for the planner to choose the access
paths a real account produces, so an EXPLAIN there would pin nothing.
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