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--module(query_pipeline_test).
--include_lib("eunit/include/eunit.hrl").
--include("operations.hrl").
-
-%%% Test Suite for Query Pipeline (Volcano Iterator Model)
-
-query_pipeline_test_() ->
- {foreach,
- fun setup/0,
- fun cleanup/1,
- [
- fun test_select_iterator/1,
- fun test_project_iterator/1,
- fun test_take_iterator/1,
- fun test_sort_iterator/1,
- fun test_composed_pipeline/1,
- fun test_materialize_finite/1,
- fun test_materialize_infinite/1,
- fun test_complete_query_pipeline/1
- ]}.
-
-%%% Setup and Cleanup
-
-setup() ->
- operations:setup(),
- DB = operations:create_database(test_db),
-
- %% Create employees relation with test data
- {DB1, _} = operations:create_relation(DB, employees, #{
- name => string,
- age => integer,
- department => string
- }),
-
- {DB2, _} = operations:create_tuple(DB1, employees, #{name => "Alice", age => 35, department => "Engineering"}),
- {DB3, _} = operations:create_tuple(DB2, employees, #{name => "Bob", age => 28, department => "Sales"}),
- {DB4, _} = operations:create_tuple(DB3, employees, #{name => "Carol", age => 42, department => "Engineering"}),
- {DB5, _} = operations:create_tuple(DB4, employees, #{name => "Dave", age => 31, department => "Marketing"}),
- {DB6, _} = operations:create_tuple(DB5, employees, #{name => "Eve", age => 29, department => "Engineering"}),
-
- DB6.
-
-cleanup(_DB) ->
- ok.
-
-%%% Tests
-
-test_select_iterator(DB) ->
- %% Filter employees age > 30
- BaseIter = operations:get_tuples_iterator(DB, employees, #{}),
- FilteredIter = operations:select_iterator(BaseIter,
- fun(E) -> maps:get(age, E) > 30 end),
- Results = operations:collect_all(FilteredIter),
-
- %% Should get 3 employees: Alice (35), Carol (42), Dave (31)
- [
- ?_assertEqual(3, length(Results)),
- ?_assert(lists:all(fun(E) -> maps:get(age, E) > 30 end, Results))
- ].
-
-test_project_iterator(DB) ->
- %% Project to [name, age] only
- BaseIter = operations:get_tuples_iterator(DB, employees, #{}),
- ProjectedIter = operations:project_iterator(BaseIter, [name, age]),
- Results = operations:collect_all(ProjectedIter),
-
- %% Should have only name and age fields
- [
- ?_assertEqual(5, length(Results)),
- ?_assert(lists:all(fun(E) ->
- maps:is_key(name, E) andalso
- maps:is_key(age, E) andalso
- not maps:is_key(department, E)
- end, Results))
- ].
-
-test_take_iterator(DB) ->
- %% Take first 3 employees
- BaseIter = operations:get_tuples_iterator(DB, employees, #{}),
- LimitedIter = operations:take_iterator(BaseIter, 3),
- Results = operations:collect_all(LimitedIter),
-
- [
- ?_assertEqual(3, length(Results))
- ].
-
-test_sort_iterator(DB) ->
- %% Sort by age ascending
- BaseIter = operations:get_tuples_iterator(DB, employees, #{}),
- SortedIter = operations:sort_iterator(BaseIter,
- fun(A, B) -> maps:get(age, A) =< maps:get(age, B) end),
- Results = operations:collect_all(SortedIter),
-
- Ages = [maps:get(age, E) || E <- Results],
-
- [
- ?_assertEqual(5, length(Results)),
- ?_assertEqual([28, 29, 31, 35, 42], Ages)
- ].
-
-test_composed_pipeline(DB) ->
- %% Complex pipeline: filter age > 30, sort by age, take 2, project [name]
- Iter1 = operations:get_tuples_iterator(DB, employees, #{}),
- Iter2 = operations:select_iterator(Iter1, fun(E) -> maps:get(age, E) > 30 end),
- Iter3 = operations:sort_iterator(Iter2, fun(A, B) -> maps:get(age, A) =< maps:get(age, B) end),
- Iter4 = operations:take_iterator(Iter3, 2),
- Pipeline = operations:project_iterator(Iter4, [name]),
-
- Results = operations:collect_all(Pipeline),
-
- %% Should get 2 oldest employees over 30: Dave (31), Alice (35)
- Names = [maps:get(name, R) || R <- Results],
-
- [
- ?_assertEqual(2, length(Results)),
- ?_assertEqual(["Dave", "Alice"], Names),
- ?_assert(lists:all(fun(R) -> not maps:is_key(age, R) end, Results))
- ].
-
-test_materialize_finite(DB) ->
- %% Build pipeline and materialize
- Iter1 = operations:get_tuples_iterator(DB, employees, #{}),
- Iter2 = operations:select_iterator(Iter1, fun(E) ->
- maps:get(department, E) =:= "Engineering"
- end),
- Pipeline = operations:project_iterator(Iter2, [name, age]),
-
- {DB1, EngineersRel} = operations:materialize(DB, Pipeline, engineers),
-
- %% Verify new relation
- [
- ?_assert(is_record(EngineersRel, relation)),
- ?_assertEqual(engineers, EngineersRel#relation.name),
- ?_assertEqual({finite, 3}, EngineersRel#relation.cardinality),
-
- %% Can query the materialized relation
- ?_assertMatch([_,_,_],
- operations:collect_all(operations:get_tuples_iterator(DB1, engineers, #{})))
- ].
-
-test_materialize_infinite(DB) ->
- %% Naturals are built-in, no need to create them
-
- %% Take 100 and materialize
- Pipeline = operations:get_tuples_iterator(DB, natural, #{value => {range, 0, 99}}),
- {_DB2, Naturals100} = operations:materialize(DB, Pipeline, naturals_100),
-
- [
- ?_assertEqual({finite, 100}, Naturals100#relation.cardinality),
- ?_assertEqual(naturals_100, Naturals100#relation.name)
- ].
-
-test_complete_query_pipeline(DB) ->
- %% Realistic query:
- %% SELECT name, age FROM employees
- %% WHERE age > 28
- %% ORDER BY age DESC
- %% LIMIT 3
-
- Iter1 = operations:get_tuples_iterator(DB, employees, #{}),
- Iter2 = operations:select_iterator(Iter1, fun(E) -> maps:get(age, E) > 28 end),
- Iter3 = operations:sort_iterator(Iter2, fun(A, B) ->
- maps:get(age, A) >= maps:get(age, B) % DESC
- end),
- Iter4 = operations:take_iterator(Iter3, 3),
- Pipeline = operations:project_iterator(Iter4, [name, age]),
-
- {DB1, TopEmployees} = operations:materialize(DB, Pipeline, top_3_employees),
-
- %% Verify result - NOTE: Relations are unordered sets!
- %% After materialization, tuples come back in hash order, not sort order
- Results = operations:collect_all(operations:get_tuples_iterator(DB1, top_3_employees, #{})),
- Ages = lists:sort(fun(A, B) -> A >= B end, [maps:get(age, R) || R <- Results]),
-
- [
- ?_assertEqual(3, length(Results)),
- ?_assertEqual([42, 35, 31], Ages), % Verify we have the right ages (sorted DESC for check)
- ?_assert(lists:all(fun(R) ->
- Age = maps:get(age, R),
- lists:member(Age, [42, 35, 31])
- end, Results)),
- ?_assertEqual({finite, 3}, TopEmployees#relation.cardinality)
- ].
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