prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  [AIRFLOW-3014] Fix multiple alembic heads
  Make sure you have checked _all_ steps below.
  
  ### Jira
  
  - [ ] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
    - https://issues.apache.org/jira/browse/AIRFLOW-6224
    - In case you are fixing a typo in the documentation you can prepend your commit with \[AIRFLOW-XXX\], code changes always need a Jira issue.
    - In case you are proposing a fundamental code change, you need to create an Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)).
    - In case you are adding a dependency, check if the license complies with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x).
  
  ### Description
  
  - [ ] Here are some details about my PR, including screenshots of any UI changes:
  
  ### Tests
  
  - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
  
  ### Commits
  
  - [ ] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
    1. Subject is separated from body by a blank line
    1. Subject is limited to 50 characters (not including Jira issue reference)
    1. Subject does not end with a period
    1. Subject uses the imperative mood ("add", not "adding")
    1. Body wraps at 72 characters
    1. Body explains "what" and "why", not "how"
  
  ### Documentation
  
  - [ ] In case of new functionality, my PR adds documentation that describes how to use it.
    - All the public functions and the classes in the PR contain docstrings that explain what it does
    - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
  
  
  </issue>
  <code>
  [start of airflow/migrations/versions/c1840b4bcf1a_increase_length_of_password_column_in_.py]
  1 #
  2 # Licensed to the Apache Software Foundation (ASF) under one
  3 # or more contributor license agreements.  See the NOTICE file
  4 # distributed with this work for additional information
  5 # regarding copyright ownership.  The ASF licenses this file
  6 # to you under the Apache License, Version 2.0 (the
  7 # "License"); you may not use this file except in compliance
  8 # with the License.  You may obtain a copy of the License at
  9 #
  10 #   http://www.apache.org/licenses/LICENSE-2.0
  11 #
  12 # Unless required by applicable law or agreed to in writing,
  13 # software distributed under the License is distributed on an
  14 # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  15 # KIND, either express or implied.  See the License for the
  16 # specific language governing permissions and limitations
  17 # under the License.
  18 
  19 """Increase length of password column in connection table
  20 
  21 Revision ID: c1840b4bcf1a
  22 Revises: 004c1210f153
  23 Create Date: 2019-10-02 16:56:54.865550
  24 
  25 """
  26 
  27 import sqlalchemy as sa
  28 from alembic import op
  29 
  30 # revision identifiers, used by Alembic.
  31 revision = 'c1840b4bcf1a'
  32 down_revision = '004c1210f153'
  33 branch_labels = None
  34 depends_on = None
  35 
  36 
  37 def upgrade():
  38     conn = op.get_bind()
  39     if conn.dialect.name == 'sqlite':
  40         # SQLite does not allow column modifications so we need to skip this migration
  41         return
  42 
  43     op.alter_column(table_name='connection',
  44                     column_name='password',
  45                     type_=sa.String(length=5000))
  46 
  47 
  48 def downgrade():
  49     # Can't be undone
  50     pass
  51
  [end of airflow/migrations/versions/c1840b4bcf1a_increase_length_of_password_column_in_.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/airflow/migrations/versions/c1840b4bcf1a_increase_length_of_password_column_in_.py b/airflow/migrations/versions/c1840b4bcf1a_increase_length_of_password_column_in_.py
  deleted file mode 100644
  --- a/airflow/migrations/versions/c1840b4bcf1a_increase_length_of_password_column_in_.py
  +++ /dev/null
  @@ -1,50 +0,0 @@
  -#
  -# 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.
  -
  -"""Increase length of password column in connection table
  -
  -Revision ID: c1840b4bcf1a
  -Revises: 004c1210f153
  -Create Date: 2019-10-02 16:56:54.865550
  -
  -"""
  -
  -import sqlalchemy as sa
  -from alembic import op
  -
  -# revision identifiers, used by Alembic.
  -revision = 'c1840b4bcf1a'
  -down_revision = '004c1210f153'
  -branch_labels = None
  -depends_on = None
  -
  -
  -def upgrade():
  -    conn = op.get_bind()
  -    if conn.dialect.name == 'sqlite':
  -        # SQLite does not allow column modifications so we need to skip this migration
  -        return
  -
  -    op.alter_column(table_name='connection',
  -                    column_name='password',
  -                    type_=sa.String(length=5000))
  -
  -
  -def downgrade():
  -    # Can't be undone
  -    pass
  
verification_info: {"golden_diff": "diff --git a/airflow/migrations/versions/c1840b4bcf1a_increase_length_of_password_column_in_.py b/airflow/migrations/versions/c1840b4bcf1a_increase_length_of_password_column_in_.py\ndeleted file mode 100644\n--- a/airflow/migrations/versions/c1840b4bcf1a_increase_length_of_password_column_in_.py\n+++ /dev/null\n@@ -1,50 +0,0 @@\n-#\n-# Licensed to the Apache Software Foundation (ASF) under one\n-# or more contributor license agreements.  See the NOTICE file\n-# distributed with this work for additional information\n-# regarding copyright ownership.  The ASF licenses this file\n-# to you under the Apache License, Version 2.0 (the\n-# \"License\"); you may not use this file except in compliance\n-# with the License.  You may obtain a copy of the License at\n-#\n-#   http://www.apache.org/licenses/LICENSE-2.0\n-#\n-# Unless required by applicable law or agreed to in writing,\n-# software distributed under the License is distributed on an\n-# \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\n-# KIND, either express or implied.  See the License for the\n-# specific language governing permissions and limitations\n-# under the License.\n-\n-\"\"\"Increase length of password column in connection table\n-\n-Revision ID: c1840b4bcf1a\n-Revises: 004c1210f153\n-Create Date: 2019-10-02 16:56:54.865550\n-\n-\"\"\"\n-\n-import sqlalchemy as sa\n-from alembic import op\n-\n-# revision identifiers, used by Alembic.\n-revision = 'c1840b4bcf1a'\n-down_revision = '004c1210f153'\n-branch_labels = None\n-depends_on = None\n-\n-\n-def upgrade():\n-    conn = op.get_bind()\n-    if conn.dialect.name == 'sqlite':\n-        # SQLite does not allow column modifications so we need to skip this migration\n-        return\n-\n-    op.alter_column(table_name='connection',\n-                    column_name='password',\n-                    type_=sa.String(length=5000))\n-\n-\n-def downgrade():\n-    # Can't be undone\n-    pass\n", "issue": "[AIRFLOW-3014] Fix multiple alembic heads\nMake sure you have checked _all_ steps below.\r\n\r\n### Jira\r\n\r\n- [ ] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, \"\\[AIRFLOW-XXX\\] My Airflow PR\"\r\n  - https://issues.apache.org/jira/browse/AIRFLOW-6224\r\n  - In case you are fixing a typo in the documentation you can prepend your commit with \\[AIRFLOW-XXX\\], code changes always need a Jira issue.\r\n  - In case you are proposing a fundamental code change, you need to create an Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)).\r\n  - In case you are adding a dependency, check if the license complies with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x).\r\n\r\n### Description\r\n\r\n- [ ] Here are some details about my PR, including screenshots of any UI changes:\r\n\r\n### Tests\r\n\r\n- [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:\r\n\r\n### Commits\r\n\r\n- [ ] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from \"[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)\":\r\n  1. Subject is separated from body by a blank line\r\n  1. Subject is limited to 50 characters (not including Jira issue reference)\r\n  1. Subject does not end with a period\r\n  1. Subject uses the imperative mood (\"add\", not \"adding\")\r\n  1. Body wraps at 72 characters\r\n  1. Body explains \"what\" and \"why\", not \"how\"\r\n\r\n### Documentation\r\n\r\n- [ ] In case of new functionality, my PR adds documentation that describes how to use it.\r\n  - All the public functions and the classes in the PR contain docstrings that explain what it does\r\n  - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release\r\n\n", "before_files": [{"content": "#\n# Licensed to the Apache Software Foundation (ASF) under one\n# or more contributor license agreements.  See the NOTICE file\n# distributed with this work for additional information\n# regarding copyright ownership.  The ASF licenses this file\n# to you under the Apache License, Version 2.0 (the\n# \"License\"); you may not use this file except in compliance\n# with the License.  You may obtain a copy of the License at\n#\n#   http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing,\n# software distributed under the License is distributed on an\n# \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\n# KIND, either express or implied.  See the License for the\n# specific language governing permissions and limitations\n# under the License.\n\n\"\"\"Increase length of password column in connection table\n\nRevision ID: c1840b4bcf1a\nRevises: 004c1210f153\nCreate Date: 2019-10-02 16:56:54.865550\n\n\"\"\"\n\nimport sqlalchemy as sa\nfrom alembic import op\n\n# revision identifiers, used by Alembic.\nrevision = 'c1840b4bcf1a'\ndown_revision = '004c1210f153'\nbranch_labels = None\ndepends_on = None\n\n\ndef upgrade():\n    conn = op.get_bind()\n    if conn.dialect.name == 'sqlite':\n        # SQLite does not allow column modifications so we need to skip this migration\n        return\n\n    op.alter_column(table_name='connection',\n                    column_name='password',\n                    type_=sa.String(length=5000))\n\n\ndef downgrade():\n    # Can't be undone\n    pass\n", "path": "airflow/migrations/versions/c1840b4bcf1a_increase_length_of_password_column_in_.py"}]}