[Python] Casting Table to new schema ignores nullability of fields #32000

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Closed
[Python] Casting Table to new schema ignores nullability of fields#32000
Labels
Component: PythonType: buggood-first-issuegood-second-issue
Milestone
10.0.0

Description

@asfimport
asfimport
opened on May 25, 2022

Similar to ARROW-15478, but not for nested fields but just for casting a full Table (in theory that could be the same code, but currently the Table.cast logic is implemented in cython).

So currently when casting a Table to a new schema, the nullability of the fields in the schema is ignored (and as a result you get an "invalid" schema indicating a field is non-nullable that actually can have nulls):

>>> table = pa.table({'a': [None, 1]})
>>> tablepyarrow.Tablea: int64
----
a: [[null,1]]
>>> new_schema = pa.schema([pa.field("a", "int64", nullable=False)])
>>> table.cast(new_schema)
pyarrow.Tablea: int64notnull
----
a: [[null,1]]

Reporter: Joris Van den Bossche / @jorisvandenbossche
Assignee: Kshiteej K / @kshitij12345

Related issues:

PRs and other links:

Note: This issue was originally created as ARROW-16651. Please see the migration documentation for further details.

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      , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

      Skip to content
      [Python] Casting Table to new schema ignores nullability of fields #32000
      Closed
      Closed
      [Python] Casting Table to new schema ignores nullability of fields#32000
      Labels
      Component: PythonType: buggood-first-issuegood-second-issue
      Milestone
      10.0.0
      Description
      @asfimport
      asfimport
      opened on May 25, 2022
      Similar to ARROW-15478, but not for nested fields but just for casting a full Table (in theory that could be the same code, but currently the Table.cast logic is implemented in cython).
      So currently when casting a Table to a new schema, the nullability of the fields in the schema is ignored (and as a result you get an "invalid" schema indicating a field is non-nullable that actually can have nulls):
      >>> table = pa.table({'a': [None, 1]})
>>> tablepyarrow.Tablea: int64
----
a: [[null,1]]
>>> new_schema = pa.schema([pa.field("a", "int64", nullable=False)])
>>> table.cast(new_schema)
pyarrow.Tablea: int64notnull
----
a: [[null,1]]
      Reporter: Joris Van den Bossche / @jorisvandenbossche
      Assignee: Kshiteej K / @kshitij12345
      Related issues:
      PRs and other links:
      Note: This issue was originally created as ARROW-16651. Please see the migration documentation for further details.
      Activity
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          [Python] Casting Table to new schema ignores nullability of fields #32000
          Closed
          Closed
          [Python] Casting Table to new schema ignores nullability of fields#32000
          Labels
          Component: PythonType: buggood-first-issuegood-second-issue
          Milestone
          10.0.0
          Description
          @asfimport
          asfimport
          opened on May 25, 2022
          Similar to ARROW-15478, but not for nested fields but just for casting a full Table (in theory that could be the same code, but currently the Table.cast logic is implemented in cython).
          So currently when casting a Table to a new schema, the nullability of the fields in the schema is ignored (and as a result you get an "invalid" schema indicating a field is non-nullable that actually can have nulls):
          >>> table = pa.table({'a': [None, 1]})
>>> tablepyarrow.Tablea: int64
----
a: [[null,1]]
>>> new_schema = pa.schema([pa.field("a", "int64", nullable=False)])
>>> table.cast(new_schema)
pyarrow.Tablea: int64notnull
----
a: [[null,1]]
          Reporter: Joris Van den Bossche / @jorisvandenbossche
          Assignee: Kshiteej K / @kshitij12345
          Related issues:
          PRs and other links:
          Note: This issue was originally created as ARROW-16651. Please see the migration documentation for further details.
          Activity
          Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
          Metadata
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          No one assigned
            Labels
            Component: PythonType: buggood-first-issuegood-second-issue
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              [Python] Casting Table to new schema ignores nullability of fields #32000
              Closed
              Closed
              [Python] Casting Table to new schema ignores nullability of fields#32000
              Labels
              Component: PythonType: buggood-first-issuegood-second-issue
              Milestone
              10.0.0
              Description
              @asfimport
              asfimport
              opened on May 25, 2022
              Similar to ARROW-15478, but not for nested fields but just for casting a full Table (in theory that could be the same code, but currently the Table.cast logic is implemented in cython).
              So currently when casting a Table to a new schema, the nullability of the fields in the schema is ignored (and as a result you get an "invalid" schema indicating a field is non-nullable that actually can have nulls):
              >>> table = pa.table({'a': [None, 1]})
>>> tablepyarrow.Tablea: int64
----
a: [[null,1]]
>>> new_schema = pa.schema([pa.field("a", "int64", nullable=False)])
>>> table.cast(new_schema)
pyarrow.Tablea: int64notnull
----
a: [[null,1]]
              Reporter: Joris Van den Bossche / @jorisvandenbossche
              Assignee: Kshiteej K / @kshitij12345
              Related issues:
              PRs and other links:
              Note: This issue was originally created as ARROW-16651. Please see the migration documentation for further details.
              Activity
              Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
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                Component: PythonType: buggood-first-issuegood-second-issue
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                  None yet
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                  No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

                  Skip to content
                  [Python] Casting Table to new schema ignores nullability of fields #32000
                  Closed
                  Closed
                  [Python] Casting Table to new schema ignores nullability of fields#32000
                  Labels
                  Component: PythonType: buggood-first-issuegood-second-issue
                  Milestone
                  10.0.0
                  Description
                  @asfimport
                  asfimport
                  opened on May 25, 2022
                  Similar to ARROW-15478, but not for nested fields but just for casting a full Table (in theory that could be the same code, but currently the Table.cast logic is implemented in cython).
                  So currently when casting a Table to a new schema, the nullability of the fields in the schema is ignored (and as a result you get an "invalid" schema indicating a field is non-nullable that actually can have nulls):
                  >>> table = pa.table({'a': [None, 1]})
>>> tablepyarrow.Tablea: int64
----
a: [[null,1]]
>>> new_schema = pa.schema([pa.field("a", "int64", nullable=False)])
>>> table.cast(new_schema)
pyarrow.Tablea: int64notnull
----
a: [[null,1]]
                  Reporter: Joris Van den Bossche / @jorisvandenbossche
                  Assignee: Kshiteej K / @kshitij12345
                  Related issues:
                  PRs and other links:
                  Note: This issue was originally created as ARROW-16651. Please see the migration documentation for further details.
                  Activity
                  Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
                  Metadata
                  Metadata
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                  No one assigned
                    Labels
                    Component: PythonType: buggood-first-issuegood-second-issue
                    Type
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                    Projects
                    No projects
                      Milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      [Python] Casting Table to new schema ignores nullability of fields #32000
                      Closed
                      Closed
                      [Python] Casting Table to new schema ignores nullability of fields#32000
                      Labels
                      Component: PythonType: buggood-first-issuegood-second-issue
                      Milestone
                      10.0.0
                      Description
                      @asfimport
                      asfimport
                      opened on May 25, 2022
                      Similar to ARROW-15478, but not for nested fields but just for casting a full Table (in theory that could be the same code, but currently the Table.cast logic is implemented in cython).
                      So currently when casting a Table to a new schema, the nullability of the fields in the schema is ignored (and as a result you get an "invalid" schema indicating a field is non-nullable that actually can have nulls):
                      >>> table = pa.table({'a': [None, 1]})
>>> tablepyarrow.Tablea: int64
----
a: [[null,1]]
>>> new_schema = pa.schema([pa.field("a", "int64", nullable=False)])
>>> table.cast(new_schema)
pyarrow.Tablea: int64notnull
----
a: [[null,1]]
                      Reporter: Joris Van den Bossche / @jorisvandenbossche
                      Assignee: Kshiteej K / @kshitij12345
                      Related issues:
                      PRs and other links:
                      Note: This issue was originally created as ARROW-16651. Please see the migration documentation for further details.
                      Activity
                      Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
                      Metadata
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                        Labels
                        Component: PythonType: buggood-first-issuegood-second-issue
                        Type
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                          Milestone
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                          None yet
                          Development
                          No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          [Python] Casting Table to new schema ignores nullability of fields #32000
                          Closed
                          Closed
                          [Python] Casting Table to new schema ignores nullability of fields#32000
                          Labels
                          Component: PythonType: buggood-first-issuegood-second-issue
                          Milestone
                          10.0.0
                          Description
                          @asfimport
                          asfimport
                          opened on May 25, 2022
                          Similar to ARROW-15478, but not for nested fields but just for casting a full Table (in theory that could be the same code, but currently the Table.cast logic is implemented in cython).
                          So currently when casting a Table to a new schema, the nullability of the fields in the schema is ignored (and as a result you get an "invalid" schema indicating a field is non-nullable that actually can have nulls):
                          >>> table = pa.table({'a': [None, 1]})
>>> tablepyarrow.Tablea: int64
----
a: [[null,1]]
>>> new_schema = pa.schema([pa.field("a", "int64", nullable=False)])
>>> table.cast(new_schema)
pyarrow.Tablea: int64notnull
----
a: [[null,1]]
                          Reporter: Joris Van den Bossche / @jorisvandenbossche
                          Assignee: Kshiteej K / @kshitij12345
                          Related issues:
                          PRs and other links:
                          Note: This issue was originally created as ARROW-16651. Please see the migration documentation for further details.
                          Activity
                          Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
                          Metadata
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                          No one assigned
                            Labels
                            Component: PythonType: buggood-first-issuegood-second-issue
                            Type
                            No type
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                            No projects
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                              None yet
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                              No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                              Skip to content
                              [Python] Casting Table to new schema ignores nullability of fields #32000
                              Closed
                              Closed
                              [Python] Casting Table to new schema ignores nullability of fields#32000
                              Labels
                              Component: PythonType: buggood-first-issuegood-second-issue
                              Milestone
                              10.0.0
                              Description
                              @asfimport
                              asfimport
                              opened on May 25, 2022
                              Similar to ARROW-15478, but not for nested fields but just for casting a full Table (in theory that could be the same code, but currently the Table.cast logic is implemented in cython).
                              So currently when casting a Table to a new schema, the nullability of the fields in the schema is ignored (and as a result you get an "invalid" schema indicating a field is non-nullable that actually can have nulls):
                              >>> table = pa.table({'a': [None, 1]})
>>> tablepyarrow.Tablea: int64
----
a: [[null,1]]
>>> new_schema = pa.schema([pa.field("a", "int64", nullable=False)])
>>> table.cast(new_schema)
pyarrow.Tablea: int64notnull
----
a: [[null,1]]
                              Reporter: Joris Van den Bossche / @jorisvandenbossche
                              Assignee: Kshiteej K / @kshitij12345
                              Related issues:
                              PRs and other links:
                              Note: This issue was originally created as ARROW-16651. Please see the migration documentation for further details.
                              Activity
                              Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
                              Metadata
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                              Assignees
                              No one assigned
                                Labels
                                Component: PythonType: buggood-first-issuegood-second-issue
                                Type
                                No type
                                Projects
                                No projects
                                  Milestone
                                  Relationships
                                  None yet
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                                  No branches or pull requests
                                  Issue actions