# Page Not Found

The URL `.../array-columns` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Array Columns](https://haya-toumy.gitbook.io/spark-notes/spark-scala/spark-scala/array-columns.md)
- [Operations on One Column](https://haya-toumy.gitbook.io/spark-notes/spark-scala/spark-scala/operations-on-one-column.md)
- [Merging and Cleanup Duplicate Columns](https://haya-toumy.gitbook.io/spark-notes/pyspark/pyspark/merging-and-cleanup-duplicate-columns.md)
- [Operations on Multiple Columns at Once](https://haya-toumy.gitbook.io/spark-notes/pyspark/pyspark/operations-on-multiple-columns-at-once.md)
- [Spark Scala Fundamentals](https://haya-toumy.gitbook.io/spark-notes/spark-scala/spark-scala/spark-scala-fundamentals.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://haya-toumy.gitbook.io/spark-notes/spark-scala/spark-scala/array-columns.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://haya-toumy.gitbook.io/spark-notes/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://haya-toumy.gitbook.io/spark-notes/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/spark-notes/spark-scala/spark-scala/array-columns.md`).

You may also use `Accept: text/markdown` header for content negotiation.