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2026-07-13 12:25:07 +08:00

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JavaScript

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// ┃ ██████ ██████ ██████ █ █ █ █ █ █▄ ▀███ █ ┃
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// ┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫
// ┃ Copyright (c) 2017, the Perspective Authors. ┃
// ┃ ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ ┃
// ┃ This file is part of the Perspective library, distributed under the terms ┃
// ┃ of the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0). ┃
// ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
import { test, expect } from "@perspective-dev/test";
import { describeDuckDB } from "./setup.js";
describeDuckDB("view", (getClient) => {
test("num_rows()", async function () {
const table = await getClient().open_table("memory.superstore");
const view = await table.view({ columns: ["Sales", "Profit"] });
const numRows = await view.num_rows();
expect(numRows).toBe(9994);
await view.delete();
});
test("num_columns()", async function () {
const table = await getClient().open_table("memory.superstore");
const view = await table.view({
columns: ["Sales", "Profit", "State"],
});
const numColumns = await view.num_columns();
expect(numColumns).toBe(3);
await view.delete();
});
test("schema()", async function () {
const table = await getClient().open_table("memory.superstore");
const view = await table.view({
columns: ["Sales", "Profit", "State"],
});
const schema = await view.schema();
expect(schema).toEqual({
Sales: "float",
Profit: "float",
State: "string",
});
await view.delete();
});
test("to_json()", async function () {
const table = await getClient().open_table("memory.superstore");
const view = await table.view({
columns: ["Sales", "Quantity"],
});
const json = await view.to_json({ start_row: 0, end_row: 5 });
expect(json).toEqual([
{ Sales: 261.96, Quantity: 2 },
{ Sales: 731.94, Quantity: 3 },
{ Sales: 14.62, Quantity: 2 },
{ Sales: 957.5775, Quantity: 5 },
{ Sales: 22.368, Quantity: 2 },
]);
await view.delete();
});
test("to_columns()", async function () {
const table = await getClient().open_table("memory.superstore");
const view = await table.view({
columns: ["Sales", "Quantity"],
});
const columns = await view.to_columns({
start_row: 0,
end_row: 5,
});
expect(columns).toEqual({
Sales: [261.96, 731.94, 14.62, 957.5775, 22.368],
Quantity: [2, 3, 2, 5, 2],
});
await view.delete();
});
test("column_paths()", async function () {
const table = await getClient().open_table("memory.superstore");
const view = await table.view({
columns: ["Sales", "Profit", "State"],
});
const paths = await view.column_paths();
expect(paths).toEqual(["Sales", "Profit", "State"]);
await view.delete();
});
});