chore: import upstream snapshot with attribution

2026-07-13 12:25:07 +08:00
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+# ClickHouse Virtual Server
+
+Perspective provides a built-in virtual server for
+[ClickHouse](https://clickhouse.com/), allowing `<perspective-viewer>` to query
+ClickHouse tables directly from the browser.
+
+For server-side Python usage, see the
+[Python ClickHouse guide](../../python/virtual_server/clickhouse.md).
+
+## Installation
+
+```bash
+npm install @perspective-dev/client @perspective-dev/viewer @clickhouse/client-web
+```
+
+## Usage
+
+Connect to a ClickHouse instance and bind it to a Perspective viewer:
+
+```javascript
+import perspective from "@perspective-dev/client";
+import "@perspective-dev/viewer";
+import { createClient } from "@clickhouse/client-web";
+
+// Connect to ClickHouse
+const clickhouseClient = createClient({
+    url: "http://localhost:8123",
+    database: "default",
+});
+
+// Create a Perspective virtual server backed by ClickHouse
+const handler = perspective.ClickhouseHandler(clickhouseClient);
+const messageHandler = perspective.createMessageHandler(handler);
+
+// Connect a viewer
+const client = await perspective.worker(messageHandler);
+const table = await client.open_table("my_table");
+document.getElementById("viewer").load(table);
+```
+
+## Examples
+
+- [Browser ClickHouse example](https://github.com/perspective-dev/perspective/tree/master/examples/esbuild-clickhouse-virtual)