[vectordb](../README.md) / [Exports](../modules.md) / ColumnAlteration

# Interface: ColumnAlteration

A definition of a column alteration. The alteration changes the column at
`path` to have the new name `name`, to be nullable if `nullable` is true,
and to have the data type `data_type`. At least one of `rename` or `nullable`
must be provided.

## Table of contents

### Properties

- [nullable](ColumnAlteration.md#nullable)
- [path](ColumnAlteration.md#path)
- [rename](ColumnAlteration.md#rename)

## Properties

### nullable

• `Optional` **nullable**: `boolean`

Set the new nullability. Note that a nullable column cannot be made non-nullable.

#### Defined in

[index.ts:638](https://github.com/lancedb/lancedb/blob/92179835/node/src/index.ts#L638)

___

### path

• **path**: `string`

The path to the column to alter. This is a dot-separated path to the column.
If it is a top-level column then it is just the name of the column. If it is
a nested column then it is the path to the column, e.g. "a.b.c" for a column
`c` nested inside a column `b` nested inside a column `a`.

#### Defined in

[index.ts:633](https://github.com/lancedb/lancedb/blob/92179835/node/src/index.ts#L633)

___

### rename

• `Optional` **rename**: `string`

#### Defined in

[index.ts:634](https://github.com/lancedb/lancedb/blob/92179835/node/src/index.ts#L634)