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ARROW-7045: [R] Preserve factor in Parquet roundtrip - #6135

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The ability to preserve categorical values was introduced in #5077 as the convention of storing a special ARROW:schema key in the metadata. To invoke this, we need to call ArrowWriterProperties::store_schema().

The R binding is already ready for this, but calls store_schema() only conditionally and uses parquet___default_arrow_writer_properties() by default. Though I don't see the motivation to implement as such in #5451, considering the Python binding always calls store_schema(), I guess the R code can do the same.

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Thanks for this! LGTM

This makes me question whether default_arrow_writer_properties is right or useful, given that both R and Python are no longer using it. Should this store_schema behavior be pushed down to C++? @wesm

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ARROW-7045: [R] Preserve factor in Parquet roundtrip by yutannihilation · Pull Request #6135 · apache/arrow · GitHub
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The ability to preserve categorical values was introduced in #5077 as the convention of storing a special ARROW:schema key in the metadata. To invoke this, we need to call ArrowWriterProperties::store_schema().
The R binding is already ready for this, but calls store_schema() only conditionally and uses parquet___default_arrow_writer_properties() by default. Though I don't see the motivation to implement as such in #5451, considering the Python binding always calls store_schema(), I guess the R code can do the same.
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Thanks for this! LGTM
This makes me question whether default_arrow_writer_properties is right or useful, given that both R and Python are no longer using it. Should this store_schema behavior be pushed down to C++? @wesm
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ARROW-7045: [R] Preserve factor in Parquet roundtrip by yutannihilation · Pull Request #6135 · apache/arrow · GitHub
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The ability to preserve categorical values was introduced in #5077 as the convention of storing a special ARROW:schema key in the metadata. To invoke this, we need to call ArrowWriterProperties::store_schema().
The R binding is already ready for this, but calls store_schema() only conditionally and uses parquet___default_arrow_writer_properties() by default. Though I don't see the motivation to implement as such in #5451, considering the Python binding always calls store_schema(), I guess the R code can do the same.
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Thanks for this! LGTM
This makes me question whether default_arrow_writer_properties is right or useful, given that both R and Python are no longer using it. Should this store_schema behavior be pushed down to C++? @wesm
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ARROW-7045: [R] Preserve factor in Parquet roundtrip by yutannihilation · Pull Request #6135 · apache/arrow · GitHub
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The ability to preserve categorical values was introduced in #5077 as the convention of storing a special ARROW:schema key in the metadata. To invoke this, we need to call ArrowWriterProperties::store_schema().
The R binding is already ready for this, but calls store_schema() only conditionally and uses parquet___default_arrow_writer_properties() by default. Though I don't see the motivation to implement as such in #5451, considering the Python binding always calls store_schema(), I guess the R code can do the same.
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Thanks for this! LGTM
This makes me question whether default_arrow_writer_properties is right or useful, given that both R and Python are no longer using it. Should this store_schema behavior be pushed down to C++? @wesm
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The ability to preserve categorical values was introduced in #5077 as the convention of storing a special ARROW:schema key in the metadata. To invoke this, we need to call ArrowWriterProperties::store_schema().
The R binding is already ready for this, but calls store_schema() only conditionally and uses parquet___default_arrow_writer_properties() by default. Though I don't see the motivation to implement as such in #5451, considering the Python binding always calls store_schema(), I guess the R code can do the same.
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Thanks for this! LGTM
This makes me question whether default_arrow_writer_properties is right or useful, given that both R and Python are no longer using it. Should this store_schema behavior be pushed down to C++? @wesm
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The ability to preserve categorical values was introduced in #5077 as the convention of storing a special ARROW:schema key in the metadata. To invoke this, we need to call ArrowWriterProperties::store_schema().
The R binding is already ready for this, but calls store_schema() only conditionally and uses parquet___default_arrow_writer_properties() by default. Though I don't see the motivation to implement as such in #5451, considering the Python binding always calls store_schema(), I guess the R code can do the same.
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Thanks for this! LGTM
This makes me question whether default_arrow_writer_properties is right or useful, given that both R and Python are no longer using it. Should this store_schema behavior be pushed down to C++? @wesm
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The ability to preserve categorical values was introduced in #5077 as the convention of storing a special ARROW:schema key in the metadata. To invoke this, we need to call ArrowWriterProperties::store_schema().
The R binding is already ready for this, but calls store_schema() only conditionally and uses parquet___default_arrow_writer_properties() by default. Though I don't see the motivation to implement as such in #5451, considering the Python binding always calls store_schema(), I guess the R code can do the same.
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Thanks for this! LGTM
This makes me question whether default_arrow_writer_properties is right or useful, given that both R and Python are no longer using it. Should this store_schema behavior be pushed down to C++? @wesm
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style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
ARROW-7045: [R] Preserve factor in Parquet roundtrip by yutannihilation · Pull Request #6135 · apache/arrow · GitHub
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ARROW-7045: [R] Preserve factor in Parquet roundtrip - #6135
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ARROW-7045: [R] Preserve factor in Parquet roundtrip#6135
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Jan 7, 2020

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The ability to preserve categorical values was introduced in #5077 as the convention of storing a special ARROW:schema key in the metadata. To invoke this, we need to call ArrowWriterProperties::store_schema().
The R binding is already ready for this, but calls store_schema() only conditionally and uses parquet___default_arrow_writer_properties() by default. Though I don't see the motivation to implement as such in #5451, considering the Python binding always calls store_schema(), I guess the R code can do the same.
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https://issues.apache.org/jira/browse/ARROW-7045
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Thanks for this! LGTM
This makes me question whether default_arrow_writer_properties is right or useful, given that both R and Python are no longer using it. Should this store_schema behavior be pushed down to C++? @wesm
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Thanks for merging!
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