Change route export query by contracting the route's begin date to co…

…rrespond to

the last line header validity range when the route (direction) spans multiple
line headers temporally.

src/main/resources/jore4-export/export_routes.sql

@@ -1,14 +1,57 @@
-SELECT
-    r.network_route_number AS route_number,
-    r.network_route_hidden_variant AS hidden_variant,
-    rd.network_route_direction_id AS direction_id,
-    rd.network_route_direction_type AS direction_type,
-    rd.network_route_direction_name AS name,
-    l.network_line_jore4_id AS line_jore4_id,
-    rd.network_route_direction_valid_date_range AS valid_date_range,
-    r.network_route_legacy_hsl_municipality_code AS legacy_hsl_municipality_code
-FROM network.network_routes r
-JOIN network.network_route_directions rd USING (network_route_id)
-JOIN network.network_lines l USING (network_line_id)
-WHERE NOT isempty(rd.network_route_direction_valid_date_range * '[2021-01-01, 2050-01-01)'::daterange)
-ORDER BY rd.network_route_direction_valid_date_range DESC
+-- Contract route's begin date to correspond to the last line header validity
+-- range when the route (direction) spans multiple line headers temporally.
+WITH
+filtered_route_directions AS (
+    SELECT *
+    FROM network.network_route_directions
+    WHERE network_route_direction_valid_date_range && '[2021-01-01, 2050-01-01)'::daterange
+),
+ids_of_route_directions_overlapping_multiple_line_headers AS (
+    SELECT
+        rd.network_route_direction_id,
+        count(lh.network_line_header_id) AS overlapping_line_header_count
+    FROM filtered_route_directions rd
+    JOIN network.network_routes r USING (network_route_id)
+    JOIN network.network_lines l USING (network_line_id)
+    JOIN network.network_line_headers lh USING (network_line_id)
+    WHERE rd.network_route_direction_valid_date_range && lh.network_line_header_valid_date_range
+    GROUP BY rd.network_route_direction_id
+    HAVING count(lh.network_line_header_id) >= 2
+),
+route_directions_with_begin_date_contracted_by_last_line_header AS (
+    SELECT
+        rd.network_route_direction_id,
+        max(lower(lh.network_line_header_valid_date_range)) AS last_line_header_begin_date
+    FROM ids_of_route_directions_overlapping_multiple_line_headers rdi
+    JOIN network.network_route_directions rd USING (network_route_direction_id)
+    JOIN network.network_routes r USING (network_route_id)
+    JOIN network.network_lines l USING (network_line_id)
+    JOIN network.network_line_headers lh USING (network_line_id)
+    WHERE rd.network_route_direction_valid_date_range && lh.network_line_header_valid_date_range
+    GROUP BY rd.network_route_direction_id
+),
+range_contracted_route_directions AS (
+    SELECT
+        r.network_route_number AS route_number,
+        r.network_route_hidden_variant AS hidden_variant,
+        rd.network_route_direction_id AS direction_id,
+        rd.network_route_direction_type AS direction_type,
+        rd.network_route_direction_name AS name,
+        l.network_line_jore4_id AS line_jore4_id,
+        CASE
+            WHEN override_rd.last_line_header_begin_date IS NOT NULL
+                THEN daterange(
+                    override_rd.last_line_header_begin_date,
+                    upper(rd.network_route_direction_valid_date_range)
+                )
+            ELSE rd.network_route_direction_valid_date_range
+        END AS valid_date_range,
+        r.network_route_legacy_hsl_municipality_code AS legacy_hsl_municipality_code
+    FROM network.network_routes r
+    JOIN filtered_route_directions rd USING (network_route_id)
+    JOIN network.network_lines l USING (network_line_id)
+    LEFT JOIN route_directions_with_begin_date_contracted_by_last_line_header override_rd USING (network_route_direction_id)
+)
+SELECT *
+FROM range_contracted_route_directions
+ORDER BY valid_date_range DESC;