[DB] Optimize title_abstract indexation

alembic/versions/73112a361617_optimize_title_abstract_indexation.py

+"""Optimize title_abstract indexation
+
+Revision ID: 73112a361617
+Revises: 1fb4405b59e1
+Create Date: 2017-09-15 14:14:51.737963
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from gargantext.util.alembic import ReplaceableObject
+
+
+# revision identifiers, used by Alembic.
+revision = '73112a361617'
+down_revision = '1fb4405b59e1'
+branch_labels = None
+depends_on = None
+
+
+title_abstract_insert = ReplaceableObject(
+    'title_abstract_insert',
+    'AFTER INSERT',
+    'nodes',
+    """FOR EACH ROW
+       WHEN (NEW.hyperdata::text <> '{}'::text)
+       EXECUTE PROCEDURE title_abstract_update_trigger()"""
+)
+
+
+title_abstract_update = ReplaceableObject(
+    'title_abstract_update',
+    'AFTER UPDATE OF hyperdata',
+    'nodes',
+    """FOR EACH ROW
+       WHEN ((OLD.hyperdata ->> 'title', OLD.hyperdata ->> 'abstract')
+             IS DISTINCT FROM
+             (NEW.hyperdata ->> 'title', NEW.hyperdata ->> 'abstract'))
+       EXECUTE PROCEDURE title_abstract_update_trigger()"""
+)
+
+
+def upgrade():
+    op.replace_trigger(title_abstract_update, replaces="1fb4405b59e1.title_abstract_update")
+    op.create_trigger(title_abstract_insert)
+
+
+def downgrade():
+    op.drop_trigger(title_abstract_insert)
+    op.replace_trigger(title_abstract_update, replace_with="1fb4405b59e1.title_abstract_update")