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# Description
The current implementation of `polars into-df` and `polars into-lazy`
will throw an error if `--schema` is provided but not all columns are
defined. This PR seeks to remove this requirement so that when a partial
`--schema` is provided, the types on the defined columns are overridden
while the remaining columns take on their default types.
**Current Implementation**
```
$ [[a b]; [1 "foo"] [2 "bar"]] | polars into-df -s {a: str} | polars schema
Error: × Schema does not contain column: b
╭─[entry #88:1:12]
1 │ [[a b]; [1 "foo"] [2 "bar"]] | polars into-df -s {a: str} | polars schema
· ─────
╰────
```
**New Implementation (no error thrown on partial schema definition)**
Column b is not defined in `--schema`
```
$ [[a b]; [1 "foo"] [2 "bar"]] | polars into-df --schema {a: str} | polars schema
╭───┬─────╮
│ a │ str │
│ b │ str │
╰───┴─────╯
```
# User-Facing Changes
Soft breaking change: The user's previous (erroneous) code that would
have thrown an error would no longer throw an error. The user's previous
working code will still work.
# Tests + Formatting
# After Submitting
Nushell core libraries and plugins
These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.
Foundational libraries are split into two kinds of crates:
- Core crates - those crates that work together to build the Nushell language engine
- Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.
Plugins are likewise also split into two types:
- Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
- Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.