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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>hyparquet parquet file parser</title>
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<style>
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2024-01-11 23:20:53 +00:00
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* {
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box-sizing: border-box;
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margin: 0;
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padding: 0;
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}
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body {
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display: flex;
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font-family: sans-serif;
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height: 100vh;
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}
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nav {
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width: 300px;
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padding: 10px;
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overflow-y: auto;
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}
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h1 {
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font-size: 20pt;
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}
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h2 {
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font-size: 12pt;
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}
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p {
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margin: 10px 0;
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}
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label {
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height: 100%;
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display: flex;
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align-items: center;
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justify-content: center;
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font-size: 20px;
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}
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#dropzone {
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border: 2px dashed #08e;
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border-radius: 10px;
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flex: 1;
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margin: 10px;
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padding: 10px;
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color: #444;
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overflow: auto;
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}
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.over {
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background-color: lightblue;
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}
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.error {
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color: #c11;
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}
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#layout {
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margin-top: 20px;
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}
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#layout div {
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background-color: rgba(0, 0, 0, 0.05);
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border: 1px solid #ccc;
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border-radius: 4px;
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font-size: 12px;
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margin-top: 4px;
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padding: 4px;
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word-break: break-all;
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}
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.cell {
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display: flex;
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}
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.cell label {
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font-size: 12px;
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font-weight: normal;
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flex: 1;
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justify-content: flex-start;
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}
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#layout div ul {
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list-style: none;
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}
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#layout div li {
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font-size: 10px;
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padding: 2px 4px;
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text-align: right;
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}
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</style>
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</head>
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<body>
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<nav>
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<h1>hyparquet</h1>
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<h2>parquet file reader</h2>
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<p>
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This is a simple online demo of the <a href="https://github.com/hyparam/hyparquet">hyparquet</a> parser for apache parquet files.
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</p>
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<p>
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Drag and drop a parquet file onto the dropzone to see parquet file metadata.
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</p>
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<ul>
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<li><a href="https://github.com/hyparam/hyparquet">github</a></li>
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<li><a href="https://www.npmjs.com/package/hyparquet">npm</a></li>
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</ul>
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<div id="layout"></div>
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</nav>
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<div id="dropzone">
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<label>Drop .parquet file here</label>
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</div>
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<script type="module">
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import { parquetMetadata, toJson } from './src/hyparquet.js'
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dropzone.addEventListener('dragover', e => {
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e.preventDefault()
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e.dataTransfer.dropEffect = 'copy'
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dropzone.classList.add('over')
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})
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dropzone.addEventListener('dragleave', () => {
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dropzone.classList.remove('over')
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})
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dropzone.addEventListener('drop', e => {
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e.preventDefault() // prevent dropped file from being "downloaded"
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dropzone.classList.remove('over')
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const files = e.dataTransfer.files
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if (files.length > 0) {
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const file = files[0]
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const reader = new FileReader()
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reader.onload = async (e) => {
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try {
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const arrayBuffer = e.target.result
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const metadata = toJson(parquetMetadata(arrayBuffer))
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console.log('metadata', metadata)
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function group(name) {
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return `<div>${name}`
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}
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function cell(name, start, bytes, end) {
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return `<div class="cell"><label>${name}</label><ul><li>start ${start}</li><li>bytes ${bytes}</li><li>end ${end}</li></div>`
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}
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// render file layout
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let html = '<h2>File layout</h2>'
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html += cell('PAR1', 0, 4, 4) // magic number
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for (const rowGroupIndex in metadata.row_groups) {
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const rowGroup = metadata.row_groups[rowGroupIndex]
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html += group(`Row group ${rowGroupIndex} (${rowGroup.total_byte_size} bytes)`)
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for (const column of rowGroup.columns) {
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const columnName = column.meta_data.path_in_schema.join('.')
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let columnOffset = column.meta_data.dictionary_page_offset
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if (!columnOffset || column.meta_data.data_page_offset < columnOffset) {
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columnOffset = column.meta_data.data_page_offset
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}
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columnOffset = Number(columnOffset)
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const bytes = column.meta_data.total_compressed_size
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const end = columnOffset + bytes
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html += cell(`Column ${columnName}`, columnOffset, bytes, end)
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}
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html += '</div>'
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}
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const metadataStart = arrayBuffer.byteLength - metadata.metadata_length - 4
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html += cell('Metadata', metadataStart, metadata.metadata_length, arrayBuffer.byteLength - 4)
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html += cell('PAR1', arrayBuffer.byteLength - 4, 4, arrayBuffer.byteLength) // magic number
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layout.innerHTML = html
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// display metadata
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dropzone.innerHTML = `<strong>${file.name}</strong>`
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dropzone.innerHTML += `<pre>${JSON.stringify(metadata, null, 2)}</pre>`
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} catch (e) {
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dropzone.innerHTML = `<strong>${file.name}</strong>`
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dropzone.innerHTML += `<div class="error">Error parsing file\n${e}</div>`
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}
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}
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reader.onerror = e => {
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console.error('Error reading file', e)
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dropzone.innerText = `Error reading file\n${e.target.error}`
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}
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reader.readAsArrayBuffer(file)
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}
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})
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</script>
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</body>
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</html>
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