declare geolocation fields in schema files (fixes #14572)

It's declared as a measure whose value is the array aggregate of the points.

README.rst

@@ -24,3 +24,8 @@ cube.
           --key KEY        HMAC key for signatures
           --pg-dsn PG_DSN  Psycopg2 DB DSN
           --schema SCHEMA  schema name
+
+Requirements
+------------
+
+PostgreSQL > 9.4 is required.

wcs_olap/feeder.py

@@ -227,6 +227,12 @@ class WcsOlapFeeder(object):
                                   'count({fact_table}.id) * 100. / (select '
                                   'count({fact_table}.id) from {table_expression} where '
                                   '{where_conditions}) end',
+                },
+                {
+                    'name': 'geolocation',
+                    'label': 'localisation géographique',
+                    'type': 'point',
+                    'expression': 'array_agg("{fact_table}".geolocation_base) FILTER (WHERE "{fact_table}".geolocation_base IS NOT NULL)',
                 }
             ]
         }
@@ -383,6 +389,7 @@ CREATE TABLE public.dates AS (SELECT
             ['generic_status_id', 'smallint REFERENCES {generic_status_table} (id)'],
             ['endpoint_delay', 'interval'],
             ['first_agent_id', 'smallint REFERENCES {agent_table} (id)'],
+            ['geolocation_base', 'POINT NULL'],
             ['json_data', 'JSONB NULL'],
         ]
         self.comments = {
@@ -393,6 +400,7 @@ CREATE TABLE public.dates AS (SELECT
             'backoffice': u'soumission backoffce',
             'generic_status_id': u'statut simplifié',
             'endpoint_delay': u'délai de traitement',
+            'geolocation_base': u'position géographique',
         }
         self.create_table('{generic_formdata_table}', self.columns)
         for at, comment in self.comments.iteritems():
@@ -561,6 +569,8 @@ class WcsFormdefFeeder(object):
 
         self.columns = ([name for name, _type in self.olap_feeder.columns]
                         + [name for name, _type in columns])
+        self.columns.remove('geolocation_base')
+
         self.create_table('{formdata_table}', columns, inherits='{generic_formdata_table}',
                           comment=u'formulaire %s' % self.formdef.schema.name)
         for at, comment in comments.iteritems():
@@ -589,7 +599,8 @@ class WcsFormdefFeeder(object):
             ['date', 'date'],
             ['hour_id', 'smallint REFERENCES {hour_table} (id)'],
         ])
-        self.ex('COMMENT ON TABLE {evolution_table} IS %s', vars=(u'evolution des demandes %s' % self.formdef.schema.name,))
+        self.ex('COMMENT ON TABLE {evolution_table} IS %s',
+                vars=(u'evolution des demandes %s' % self.formdef.schema.name,))
 
     def insert_item_value(self, field, value):
         table_name = self.hash_table_name('{formdata_table}_field_%s' % field.varname)