Add index for event column in log table

airflow/migrations/versions/0109_1de7bc13c950_add_index_for_event_in_log.py

@@ -0,0 +1,44 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Add index for ``event`` column in ``log`` table.
+
+Revision ID: 1de7bc13c950
+Revises: b1b348e02d07
+Create Date: 2022-05-10 18:18:43.484829
+
+"""
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = '1de7bc13c950'
+down_revision = 'b1b348e02d07'
+branch_labels = None
+depends_on = None
+airflow_version = '2.3.1'
+
+
+def upgrade():
+    """Apply Add index for ``event`` column in ``log`` table."""
+    op.create_index('idx_log_event', 'log', ['event'], unique=False)
+
+
+def downgrade():
+    """Unapply Add index for ``event`` column in ``log`` table."""
+    op.drop_index('idx_log_event', table_name='log')

airflow/models/log.py

@@ -38,7 +38,10 @@ class Log(Base):
     owner = Column(String(500))
     extra = Column(Text)
 
-    __table_args__ = (Index('idx_log_dag', dag_id),)
+    __table_args__ = (
+        Index('idx_log_dag', dag_id),
+        Index('idx_log_event', event),
+    )
 
     def __init__(self, event, task_instance=None, owner=None, extra=None, **kwargs):
         self.dttm = timezone.utcnow()

docs/apache-airflow/migrations-ref.rst

@@ -25,7 +25,9 @@ Here's the list of all the Database Migrations that are executed via when you ru
  .. Beginning of auto-generated table
 
 +---------------------------------+-------------------+-------------+--------------------------------------------------------------+
-| ``b1b348e02d07`` (head)         | ``75d5ed6c2b43``  | ``2.3.0``   | Update dag.default_view to grid                              |
+| ``1de7bc13c950`` (head)         | ``b1b348e02d07``  | ``2.3.1``   | Add index for ``event`` column in ``log`` table.             |
++---------------------------------+-------------------+-------------+--------------------------------------------------------------+
+| ``b1b348e02d07``                | ``75d5ed6c2b43``  | ``2.3.0``   | Update dag.default_view to grid                              |
 +---------------------------------+-------------------+-------------+--------------------------------------------------------------+
 | ``75d5ed6c2b43``                | ``909884dea523``  | ``2.3.0``   | Add map_index to Log.                                        |
 +---------------------------------+-------------------+-------------+--------------------------------------------------------------+