Skip to content

bool(LazySelectSequence) can return None #43977

Closed
#43978
Closed
bool(LazySelectSequence) can return None#43977
#43978
Assignees
johncmerfeld
Labels
area:corekind:bugThis is a clearly a bug

Description

@johncmerfeld
johncmerfeld
opened on Nov 13, 2024

Apache Airflow version

2.10.3

If "Other Airflow 2 version" selected, which one?

No response

What happened?

The downstream effect is that

  • when doing an Xcom pull for a group of task IDs
  • when the returned list is empty
  • an exception is raised because Jinja fails to render the template
[2024-11-13, 18:05:16 UTC] {abstractoperator.py:780} ERROR - Exception rendering Jinja template for task '...'
Traceback (most recent call last):
File "airflow/models/abstractoperator.py", line 772, in _do_render_template_fields
rendered_content = self.render_template(
^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 171, in render_template
return self._render(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/models/abstractoperator.py", line 727, in _render
return super()._render(template, context, dag=dag)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 126, in _render
return render_template_as_native(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 306, in render_template_as_native
return render_template(template, cast(MutableMapping[str, Any], context), native=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 295, in render_template
return jinja2.nativetypes.native_concat(nodes)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/nativetypes.py", line 25, in native_concat
head = list(islice(values, 2))
^^^^^^^^^^^^^^^^^^^^^^^
File "<template>", line 24, in root
File "jinja2/async_utils.py", line 45, in wrapper
return normal_func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/filters.py", line 1352, in sync_do_list
return list(value)
^^^^^^^^^^^
File "jinja2/filters.py", line 1492, in sync_do_map
if value:
^^^^^
TypeError: __bool__ should return bool, returned NoneType

What you think should happen instead?

In this case an empty list should be returned

The root cause is that LazySelectSequence's __bool__ method is not airtight. I don't understand the internals well enough to know why this is so, but this is clearly an internal error, given a valid template:

"{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"

How to reproduce

  • Use a template like this to pull the return values from a list of tasks: "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"
  • Ensure that all of those tasks Skip or otherwise do not return a value

Operating System

Ubuntu 24.04.1

Versions of Apache Airflow Providers

No response

Deployment

Virtualenv installation

Deployment details

No response

Anything else?

Are you willing to submit PR?

  • Yes I am willing to submit a PR!

Code of Conduct

Metadata

Metadata

Assignees

Labels

area:corekind:bugThis is a clearly a bug

Type

No type

Projects

No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions

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`bool(LazySelectSequence)` can return `None` · Issue #43977 · apache/airflow · GitHub
    Skip to content
    bool(LazySelectSequence) can return None #43977
    Closed
    #43978
    Closed
    bool(LazySelectSequence) can return None#43977
    #43978
    Assignees
    johncmerfeld
    Labels
    area:corekind:bugThis is a clearly a bug
    Description
    @johncmerfeld
    johncmerfeld
    opened on Nov 13, 2024
    Apache Airflow version
    2.10.3
    If "Other Airflow 2 version" selected, which one?
    No response
    What happened?
    The downstream effect is that
    • when doing an Xcom pull for a group of task IDs
    • when the returned list is empty
    • an exception is raised because Jinja fails to render the template
    [2024-11-13, 18:05:16 UTC] {abstractoperator.py:780} ERROR - Exception rendering Jinja template for task '...'
Traceback (most recent call last):
File "airflow/models/abstractoperator.py", line 772, in _do_render_template_fields
rendered_content = self.render_template(
^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 171, in render_template
return self._render(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/models/abstractoperator.py", line 727, in _render
return super()._render(template, context, dag=dag)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 126, in _render
return render_template_as_native(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 306, in render_template_as_native
return render_template(template, cast(MutableMapping[str, Any], context), native=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 295, in render_template
return jinja2.nativetypes.native_concat(nodes)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/nativetypes.py", line 25, in native_concat
head = list(islice(values, 2))
^^^^^^^^^^^^^^^^^^^^^^^
File "<template>", line 24, in root
File "jinja2/async_utils.py", line 45, in wrapper
return normal_func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/filters.py", line 1352, in sync_do_list
return list(value)
^^^^^^^^^^^
File "jinja2/filters.py", line 1492, in sync_do_map
if value:
^^^^^
TypeError: __bool__ should return bool, returned NoneType

    What you think should happen instead?
    In this case an empty list should be returned
    The root cause is that LazySelectSequence's __bool__ method is not airtight. I don't understand the internals well enough to know why this is so, but this is clearly an internal error, given a valid template:
    "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"

    How to reproduce
    • Use a template like this to pull the return values from a list of tasks: "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"
    • Ensure that all of those tasks Skip or otherwise do not return a value
    Operating System
    Ubuntu 24.04.1
    Versions of Apache Airflow Providers
    No response
    Deployment
    Virtualenv installation
    Deployment details
    No response
    Anything else?
    Are you willing to submit PR?
    •  Yes I am willing to submit a PR!
    Code of Conduct
    Metadata
    Metadata
    Assignees
    Labels
    area:corekind:bugThis is a clearly a bug
    Type
    No type
    Projects
    No projects
      Milestone
      No milestone
      Relationships
      None yet
      Development
      No branches or pull requests
      Issue actions
      
, 'i');
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
`bool(LazySelectSequence)` can return `None` · Issue #43977 · apache/airflow · GitHub
      Skip to content
      bool(LazySelectSequence) can return None #43977
      Closed
      #43978
      Closed
      bool(LazySelectSequence) can return None#43977
      #43978
      Assignees
      johncmerfeld
      Labels
      area:corekind:bugThis is a clearly a bug
      Description
      @johncmerfeld
      johncmerfeld
      opened on Nov 13, 2024
      Apache Airflow version
      2.10.3
      If "Other Airflow 2 version" selected, which one?
      No response
      What happened?
      The downstream effect is that
      • when doing an Xcom pull for a group of task IDs
      • when the returned list is empty
      • an exception is raised because Jinja fails to render the template
      [2024-11-13, 18:05:16 UTC] {abstractoperator.py:780} ERROR - Exception rendering Jinja template for task '...'
Traceback (most recent call last):
File "airflow/models/abstractoperator.py", line 772, in _do_render_template_fields
rendered_content = self.render_template(
^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 171, in render_template
return self._render(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/models/abstractoperator.py", line 727, in _render
return super()._render(template, context, dag=dag)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 126, in _render
return render_template_as_native(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 306, in render_template_as_native
return render_template(template, cast(MutableMapping[str, Any], context), native=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 295, in render_template
return jinja2.nativetypes.native_concat(nodes)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/nativetypes.py", line 25, in native_concat
head = list(islice(values, 2))
^^^^^^^^^^^^^^^^^^^^^^^
File "<template>", line 24, in root
File "jinja2/async_utils.py", line 45, in wrapper
return normal_func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/filters.py", line 1352, in sync_do_list
return list(value)
^^^^^^^^^^^
File "jinja2/filters.py", line 1492, in sync_do_map
if value:
^^^^^
TypeError: __bool__ should return bool, returned NoneType

      What you think should happen instead?
      In this case an empty list should be returned
      The root cause is that LazySelectSequence's __bool__ method is not airtight. I don't understand the internals well enough to know why this is so, but this is clearly an internal error, given a valid template:
      "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"

      How to reproduce
      • Use a template like this to pull the return values from a list of tasks: "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"
      • Ensure that all of those tasks Skip or otherwise do not return a value
      Operating System
      Ubuntu 24.04.1
      Versions of Apache Airflow Providers
      No response
      Deployment
      Virtualenv installation
      Deployment details
      No response
      Anything else?
      Are you willing to submit PR?
      •  Yes I am willing to submit a PR!
      Code of Conduct
      Metadata
      Metadata
      Assignees
      Labels
      area:corekind:bugThis is a clearly a bug
      Type
      No type
      Projects
      No projects
        Milestone
        No milestone
        Relationships
        None yet
        Development
        No branches or pull requests
        Issue actions
        
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
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var ref = document.referrer;
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observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
`bool(LazySelectSequence)` can return `None` · Issue #43977 · apache/airflow · GitHub
        Skip to content
        bool(LazySelectSequence) can return None #43977
        Closed
        #43978
        Closed
        bool(LazySelectSequence) can return None#43977
        #43978
        Assignees
        johncmerfeld
        Labels
        area:corekind:bugThis is a clearly a bug
        Description
        @johncmerfeld
        johncmerfeld
        opened on Nov 13, 2024
        Apache Airflow version
        2.10.3
        If "Other Airflow 2 version" selected, which one?
        No response
        What happened?
        The downstream effect is that
        • when doing an Xcom pull for a group of task IDs
        • when the returned list is empty
        • an exception is raised because Jinja fails to render the template
        [2024-11-13, 18:05:16 UTC] {abstractoperator.py:780} ERROR - Exception rendering Jinja template for task '...'
Traceback (most recent call last):
File "airflow/models/abstractoperator.py", line 772, in _do_render_template_fields
rendered_content = self.render_template(
^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 171, in render_template
return self._render(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/models/abstractoperator.py", line 727, in _render
return super()._render(template, context, dag=dag)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 126, in _render
return render_template_as_native(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 306, in render_template_as_native
return render_template(template, cast(MutableMapping[str, Any], context), native=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 295, in render_template
return jinja2.nativetypes.native_concat(nodes)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/nativetypes.py", line 25, in native_concat
head = list(islice(values, 2))
^^^^^^^^^^^^^^^^^^^^^^^
File "<template>", line 24, in root
File "jinja2/async_utils.py", line 45, in wrapper
return normal_func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/filters.py", line 1352, in sync_do_list
return list(value)
^^^^^^^^^^^
File "jinja2/filters.py", line 1492, in sync_do_map
if value:
^^^^^
TypeError: __bool__ should return bool, returned NoneType

        What you think should happen instead?
        In this case an empty list should be returned
        The root cause is that LazySelectSequence's __bool__ method is not airtight. I don't understand the internals well enough to know why this is so, but this is clearly an internal error, given a valid template:
        "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"

        How to reproduce
        • Use a template like this to pull the return values from a list of tasks: "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"
        • Ensure that all of those tasks Skip or otherwise do not return a value
        Operating System
        Ubuntu 24.04.1
        Versions of Apache Airflow Providers
        No response
        Deployment
        Virtualenv installation
        Deployment details
        No response
        Anything else?
        Are you willing to submit PR?
        •  Yes I am willing to submit a PR!
        Code of Conduct
        Metadata
        Metadata
        Assignees
        Labels
        area:corekind:bugThis is a clearly a bug
        Type
        No type
        Projects
        No projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
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trackingParams.forEach(function(p) {
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u.searchParams.delete(p);
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var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
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mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
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var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
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observer.observe(document.body, { childList: true, subtree: true });
})();
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} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
`bool(LazySelectSequence)` can return `None` · Issue #43977 · apache/airflow · GitHub
          Skip to content
          bool(LazySelectSequence) can return None #43977
          Closed
          #43978
          Closed
          bool(LazySelectSequence) can return None#43977
          #43978
          Assignees
          johncmerfeld
          Labels
          area:corekind:bugThis is a clearly a bug
          Description
          @johncmerfeld
          johncmerfeld
          opened on Nov 13, 2024
          Apache Airflow version
          2.10.3
          If "Other Airflow 2 version" selected, which one?
          No response
          What happened?
          The downstream effect is that
          • when doing an Xcom pull for a group of task IDs
          • when the returned list is empty
          • an exception is raised because Jinja fails to render the template
          [2024-11-13, 18:05:16 UTC] {abstractoperator.py:780} ERROR - Exception rendering Jinja template for task '...'
Traceback (most recent call last):
File "airflow/models/abstractoperator.py", line 772, in _do_render_template_fields
rendered_content = self.render_template(
^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 171, in render_template
return self._render(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/models/abstractoperator.py", line 727, in _render
return super()._render(template, context, dag=dag)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 126, in _render
return render_template_as_native(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 306, in render_template_as_native
return render_template(template, cast(MutableMapping[str, Any], context), native=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 295, in render_template
return jinja2.nativetypes.native_concat(nodes)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/nativetypes.py", line 25, in native_concat
head = list(islice(values, 2))
^^^^^^^^^^^^^^^^^^^^^^^
File "<template>", line 24, in root
File "jinja2/async_utils.py", line 45, in wrapper
return normal_func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/filters.py", line 1352, in sync_do_list
return list(value)
^^^^^^^^^^^
File "jinja2/filters.py", line 1492, in sync_do_map
if value:
^^^^^
TypeError: __bool__ should return bool, returned NoneType

          What you think should happen instead?
          In this case an empty list should be returned
          The root cause is that LazySelectSequence's __bool__ method is not airtight. I don't understand the internals well enough to know why this is so, but this is clearly an internal error, given a valid template:
          "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"

          How to reproduce
          • Use a template like this to pull the return values from a list of tasks: "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"
          • Ensure that all of those tasks Skip or otherwise do not return a value
          Operating System
          Ubuntu 24.04.1
          Versions of Apache Airflow Providers
          No response
          Deployment
          Virtualenv installation
          Deployment details
          No response
          Anything else?
          Are you willing to submit PR?
          •  Yes I am willing to submit a PR!
          Code of Conduct
          Metadata
          Metadata
          Assignees
          Labels
          area:corekind:bugThis is a clearly a bug
          Type
          No type
          Projects
          No projects
            Milestone
            No milestone
            Relationships
            None yet
            Development
            No branches or pull requests
            Issue actions
            
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
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}
}
// Try immediately
tryTheater();
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setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
`bool(LazySelectSequence)` can return `None` · Issue #43977 · apache/airflow · GitHub
            Skip to content
            bool(LazySelectSequence) can return None #43977
            Closed
            #43978
            Closed
            bool(LazySelectSequence) can return None#43977
            #43978
            Assignees
            johncmerfeld
            Labels
            area:corekind:bugThis is a clearly a bug
            Description
            @johncmerfeld
            johncmerfeld
            opened on Nov 13, 2024
            Apache Airflow version
            2.10.3
            If "Other Airflow 2 version" selected, which one?
            No response
            What happened?
            The downstream effect is that
            • when doing an Xcom pull for a group of task IDs
            • when the returned list is empty
            • an exception is raised because Jinja fails to render the template
            [2024-11-13, 18:05:16 UTC] {abstractoperator.py:780} ERROR - Exception rendering Jinja template for task '...'
Traceback (most recent call last):
File "airflow/models/abstractoperator.py", line 772, in _do_render_template_fields
rendered_content = self.render_template(
^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 171, in render_template
return self._render(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/models/abstractoperator.py", line 727, in _render
return super()._render(template, context, dag=dag)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 126, in _render
return render_template_as_native(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 306, in render_template_as_native
return render_template(template, cast(MutableMapping[str, Any], context), native=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 295, in render_template
return jinja2.nativetypes.native_concat(nodes)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/nativetypes.py", line 25, in native_concat
head = list(islice(values, 2))
^^^^^^^^^^^^^^^^^^^^^^^
File "<template>", line 24, in root
File "jinja2/async_utils.py", line 45, in wrapper
return normal_func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/filters.py", line 1352, in sync_do_list
return list(value)
^^^^^^^^^^^
File "jinja2/filters.py", line 1492, in sync_do_map
if value:
^^^^^
TypeError: __bool__ should return bool, returned NoneType

            What you think should happen instead?
            In this case an empty list should be returned
            The root cause is that LazySelectSequence's __bool__ method is not airtight. I don't understand the internals well enough to know why this is so, but this is clearly an internal error, given a valid template:
            "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"

            How to reproduce
            • Use a template like this to pull the return values from a list of tasks: "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"
            • Ensure that all of those tasks Skip or otherwise do not return a value
            Operating System
            Ubuntu 24.04.1
            Versions of Apache Airflow Providers
            No response
            Deployment
            Virtualenv installation
            Deployment details
            No response
            Anything else?
            Are you willing to submit PR?
            •  Yes I am willing to submit a PR!
            Code of Conduct
            Metadata
            Metadata
            Assignees
            Labels
            area:corekind:bugThis is a clearly a bug
            Type
            No type
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
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`bool(LazySelectSequence)` can return `None` · Issue #43977 · apache/airflow · GitHub
              Skip to content
              bool(LazySelectSequence) can return None #43977
              Closed
              #43978
              Closed
              bool(LazySelectSequence) can return None#43977
              #43978
              Assignees
              johncmerfeld
              Labels
              area:corekind:bugThis is a clearly a bug
              Description
              @johncmerfeld
              johncmerfeld
              opened on Nov 13, 2024
              Apache Airflow version
              2.10.3
              If "Other Airflow 2 version" selected, which one?
              No response
              What happened?
              The downstream effect is that
              • when doing an Xcom pull for a group of task IDs
              • when the returned list is empty
              • an exception is raised because Jinja fails to render the template
              [2024-11-13, 18:05:16 UTC] {abstractoperator.py:780} ERROR - Exception rendering Jinja template for task '...'
Traceback (most recent call last):
File "airflow/models/abstractoperator.py", line 772, in _do_render_template_fields
rendered_content = self.render_template(
^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 171, in render_template
return self._render(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/models/abstractoperator.py", line 727, in _render
return super()._render(template, context, dag=dag)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 126, in _render
return render_template_as_native(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 306, in render_template_as_native
return render_template(template, cast(MutableMapping[str, Any], context), native=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 295, in render_template
return jinja2.nativetypes.native_concat(nodes)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/nativetypes.py", line 25, in native_concat
head = list(islice(values, 2))
^^^^^^^^^^^^^^^^^^^^^^^
File "<template>", line 24, in root
File "jinja2/async_utils.py", line 45, in wrapper
return normal_func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/filters.py", line 1352, in sync_do_list
return list(value)
^^^^^^^^^^^
File "jinja2/filters.py", line 1492, in sync_do_map
if value:
^^^^^
TypeError: __bool__ should return bool, returned NoneType

              What you think should happen instead?
              In this case an empty list should be returned
              The root cause is that LazySelectSequence's __bool__ method is not airtight. I don't understand the internals well enough to know why this is so, but this is clearly an internal error, given a valid template:
              "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"

              How to reproduce
              • Use a template like this to pull the return values from a list of tasks: "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"
              • Ensure that all of those tasks Skip or otherwise do not return a value
              Operating System
              Ubuntu 24.04.1
              Versions of Apache Airflow Providers
              No response
              Deployment
              Virtualenv installation
              Deployment details
              No response
              Anything else?
              Are you willing to submit PR?
              •  Yes I am willing to submit a PR!
              Code of Conduct
              Metadata
              Metadata
              Assignees
              Labels
              area:corekind:bugThis is a clearly a bug
              Type
              No type
              Projects
              No projects
                Milestone
                No milestone
                Relationships
                None yet
                Development
                No branches or pull requests
                Issue actions
                
, 'i');
if (__m === '*' || __re.test(location.href)) {
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if (!enabled) return;
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style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
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filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
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filter: invert(1) hue-rotate(180deg) !important;
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[data-theme="light"], [data-theme="light"],
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filter: none !important;
}
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filter: invert(1) hue-rotate(180deg) !important;
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::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
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var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
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if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
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console.log('[Universal Dark Mode] Enabled');
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console.log('[Universal Dark Mode] Disabled');
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applyDarkMode();
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console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
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} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
`bool(LazySelectSequence)` can return `None` · Issue #43977 · apache/airflow · GitHub
                Skip to content
                bool(LazySelectSequence) can return None #43977
                Closed
                #43978
                Closed
                bool(LazySelectSequence) can return None#43977
                #43978
                Assignees
                johncmerfeld
                Labels
                area:corekind:bugThis is a clearly a bug
                Description
                @johncmerfeld
                johncmerfeld
                opened on Nov 13, 2024
                Apache Airflow version
                2.10.3
                If "Other Airflow 2 version" selected, which one?
                No response
                What happened?
                The downstream effect is that
                • when doing an Xcom pull for a group of task IDs
                • when the returned list is empty
                • an exception is raised because Jinja fails to render the template
                [2024-11-13, 18:05:16 UTC] {abstractoperator.py:780} ERROR - Exception rendering Jinja template for task '...'
Traceback (most recent call last):
File "airflow/models/abstractoperator.py", line 772, in _do_render_template_fields
rendered_content = self.render_template(
^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 171, in render_template
return self._render(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/models/abstractoperator.py", line 727, in _render
return super()._render(template, context, dag=dag)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/template/templater.py", line 126, in _render
return render_template_as_native(template, context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 306, in render_template_as_native
return render_template(template, cast(MutableMapping[str, Any], context), native=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "airflow/utils/helpers.py", line 295, in render_template
return jinja2.nativetypes.native_concat(nodes)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/nativetypes.py", line 25, in native_concat
head = list(islice(values, 2))
^^^^^^^^^^^^^^^^^^^^^^^
File "<template>", line 24, in root
File "jinja2/async_utils.py", line 45, in wrapper
return normal_func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "jinja2/filters.py", line 1352, in sync_do_list
return list(value)
^^^^^^^^^^^
File "jinja2/filters.py", line 1492, in sync_do_map
if value:
^^^^^
TypeError: __bool__ should return bool, returned NoneType

                What you think should happen instead?
                In this case an empty list should be returned
                The root cause is that LazySelectSequence's __bool__ method is not airtight. I don't understand the internals well enough to know why this is so, but this is clearly an internal error, given a valid template:
                "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"

                How to reproduce
                • Use a template like this to pull the return values from a list of tasks: "{{ ti.xcom_pull(task_ids=['a', 'b', 'c'], key='return_value') | map(attribute=0) | list }}"
                • Ensure that all of those tasks Skip or otherwise do not return a value
                Operating System
                Ubuntu 24.04.1
                Versions of Apache Airflow Providers
                No response
                Deployment
                Virtualenv installation
                Deployment details
                No response
                Anything else?
                Are you willing to submit PR?
                •  Yes I am willing to submit a PR!
                Code of Conduct
                Metadata
                Metadata
                Assignees
                Labels
                area:corekind:bugThis is a clearly a bug
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions