> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sqd.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# E2315

> Parquet target — Invalid nested schema

A nested column declaration is malformed — an empty `STRUCT`, a `LIST` without `element`, a
non-object column declaration, or nesting too deep (possibly cyclic).

**Fix** — a `STRUCT` needs at least one field and a `LIST` needs an `element`; correct the
declaration.