Refactor OBS_GetAvailableTimespans

src/pg/sql/42_observatory_exploration.sql

@@ -405,6 +405,13 @@ BEGIN
 END
 $$ LANGUAGE plpgsql;
 
+DROP FUNCTION IF EXISTS cdb_observatory.OBS_GetAvailableTimespans(
+  bounds GEOMETRY,
+  filter_tags TEXT[],
+  numer_id TEXT,
+  denom_id TEXT,
+  geom_id TEXT
+);
 CREATE OR REPLACE FUNCTION cdb_observatory.OBS_GetAvailableTimespans(
   bounds GEOMETRY DEFAULT NULL,
   filter_tags TEXT[] DEFAULT NULL,
@@ -424,7 +431,9 @@ CREATE OR REPLACE FUNCTION cdb_observatory.OBS_GetAvailableTimespans(
   timespan_tags JSONB,
   valid_numer BOOLEAN,
   valid_denom BOOLEAN,
-  valid_geom BOOLEAN
+  valid_geom BOOLEAN,
+  timespan_alias TEXT,
+  timespan_range DATERANGE
 ) AS $$
 DECLARE
   geom_clause TEXT;
@@ -448,12 +457,14 @@ BEGIN
            NULL::TEXT timespan_aggregate,
            NULL::TEXT timespan_license,
            NULL::TEXT timespan_source,
-           NULL::TEXT timespan_type,
+           timespan_type::TEXT,
            NULL::JSONB timespan_extra,
            NULL::JSONB timespan_tags,
-    $1 = ANY(numers) valid_numer,
-    $2 = ANY(denoms) valid_denom,
-    $3 = ANY(geoms) valid_geom_id
+    COALESCE($1 = ANY(numers), false) valid_numer,
+    COALESCE($2 = ANY(denoms), false) valid_denom,
+    COALESCE($3 = ANY(geoms), false) valid_geom_id,
+           timespan_alias::TEXT,
+           timespan_range::DATERANGE
     FROM observatory.obs_meta_timespan
     WHERE %s (timespan_tags ?& $4 OR CARDINALITY($4) = 0)
   $string$, geom_clause)