Add integration tests for filters against various join types

We currently have an incomplete set of integration tests for filters
involving joins - our existing test only covers a filter against
the joined in dimension, and then implicitly discards all null values.

This change adds more robust coverage, including filters against
our current range of supported dimension join types (FULL OUTER and LEFT OUTER)
and joins allowing for NULL values on the tables that might return
NULL due to a join miss.

These tests help make some of the test coverage around predicate pushdown
operations a bit more explicit, although they are not about pushdown
specifically.

tests_metricflow/integration/test_cases/itest_constraints.yaml

@@ -150,3 +150,82 @@ integration_test:
     FROM  {{ source_schema }}.fct_bookings
     WHERE ds = {{ cast_to_ts('2020-01-01') }}
     GROUP BY ds
+---
+integration_test:
+  name: test_measure_source_constraint_with_joined_group_by
+  description: |
+    Tests a filter on the measure source with a joined in group by item that includes post-filter null values
+  model: SIMPLE_MODEL
+  metrics: ["bookings"]
+  group_bys: ["listing__is_lux_latest"]
+  where_filter: "NOT {{ render_dimension_template('booking__is_instant') }}"
+  check_query: |
+    SELECT
+      SUM(1) AS bookings
+      , l.is_lux AS listing__is_lux_latest
+    FROM {{ source_schema }}.fct_bookings b
+    LEFT OUTER JOIN {{ source_schema }}.dim_listings_latest l ON b.listing_id = l.listing_id
+    WHERE NOT b.is_instant
+    GROUP BY l.is_lux
+---
+integration_test:
+  name: test_constraint_with_joined_dimension_allowing_nulls
+  description: |
+    Tests a filter on a joined in dimension that allows post-filter null values
+  model: SIMPLE_MODEL
+  metrics: ["bookings"]
+  group_bys: ["listing__is_lux_latest"]
+  where_filter: |
+    NOT {{ render_dimension_template('listing__is_lux_latest') }}
+      OR {{ render_dimension_template('listing__is_lux_latest') }} IS NULL
+  check_query: |
+    SELECT
+      SUM(1) AS bookings
+      , l.is_lux AS listing__is_lux_latest
+    FROM {{ source_schema }}.fct_bookings b
+    LEFT OUTER JOIN {{ source_schema }}.dim_listings_latest l ON b.listing_id = l.listing_id
+    WHERE NOT l.is_lux OR l.is_lux IS NULL
+    GROUP BY l.is_lux
+---
+integration_test:
+  name: test_constraints_on_both_sides_of_a_join
+  description: |
+    Tests a filter on a joined in dimension AND a measure source dimension
+  model: SIMPLE_MODEL
+  metrics: ["bookings"]
+  group_bys: ["listing__is_lux_latest"]
+  where_filter: |
+    NOT {{ render_dimension_template('booking__is_instant') }}
+      AND (
+        NOT {{ render_dimension_template('listing__is_lux_latest') }}
+          OR {{ render_dimension_template('listing__is_lux_latest') }} IS NULL
+        )
+  check_query: |
+    SELECT
+      SUM(1) AS bookings
+      , l.is_lux AS listing__is_lux_latest
+    FROM {{ source_schema }}.fct_bookings b
+    LEFT OUTER JOIN {{ source_schema }}.dim_listings_latest l ON b.listing_id = l.listing_id
+    WHERE NOT b.is_instant AND (NOT l.is_lux OR l.is_lux IS NULL)
+    GROUP BY l.is_lux
+---
+integration_test:
+  name: test_constraints_on_joined_group_by_items
+  description: |
+    Tests a filter on a joined in dimension AND a measure source dimension
+  model: SIMPLE_MODEL
+  metrics: []
+  group_bys: ["listing__is_lux_latest", "booking__is_instant"]
+  where_filter: |
+    NOT {{ render_dimension_template('booking__is_instant') }}
+      AND (
+        NOT {{ render_dimension_template('listing__is_lux_latest') }}
+          OR {{ render_dimension_template('listing__is_lux_latest') }} IS NULL
+        )
+  check_query: |
+    SELECT DISTINCT
+      b.is_instant AS booking__is_instant
+      , l.is_lux AS listing__is_lux_latest
+    FROM {{ source_schema }}.fct_bookings b
+    LEFT OUTER JOIN {{ source_schema }}.dim_listings_latest l ON b.listing_id = l.listing_id
+    WHERE NOT b.is_instant AND (NOT l.is_lux OR l.is_lux IS NULL)