Struct SchemaBuilder 

pub struct SchemaBuilder { /* private fields */ }

Schema Builder for constructing Arrow schemas using a fluent API

Example

use dbx_core::SchemaBuilder;
use arrow::datatypes::DataType;

let schema = SchemaBuilder::new()
    .id("id")
    .text("name")
    .int32("age").nullable()
    .build();

Implementations

impl SchemaBuilder

pub fn new() -> Self

Create a new SchemaBuilder

Example

use dbx_core::SchemaBuilder;

let builder = SchemaBuilder::new();

pub fn column(self, name: &str, data_type: DataType, nullable: bool) -> Self

Add a column with explicit type and nullability

Example

use dbx_core::SchemaBuilder;
use arrow::datatypes::DataType;

let schema = SchemaBuilder::new()
    .column("id", DataType::Int64, false)
    .column("name", DataType::Utf8, true)
    .build();

pub fn build(self) -> Schema

Build the final Schema

Example

use dbx_core::SchemaBuilder;

let schema = SchemaBuilder::new()
    .id("id")
    .text("name")
    .build();

pub fn id(self, name: &str) -> Self

Add an ID column (Int64, NOT NULL)

Example

use dbx_core::SchemaBuilder;

let schema = SchemaBuilder::new()
    .id("id")
    .build();

pub fn text(self, name: &str) -> Self

Add a text column (Utf8, nullable by default)

Example

use dbx_core::SchemaBuilder;

let schema = SchemaBuilder::new()
    .text("name")
    .build();

pub fn int32(self, name: &str) -> Self

Add an Int32 column (nullable by default)

Example

use dbx_core::SchemaBuilder;

let schema = SchemaBuilder::new()
    .int32("age")
    .build();

pub fn int64(self, name: &str) -> Self

Add an Int64 column (nullable by default)

Example

use dbx_core::SchemaBuilder;

let schema = SchemaBuilder::new()
    .int64("user_id")
    .build();

pub fn float64(self, name: &str) -> Self

Add a Float64 column (nullable by default)

Example

use dbx_core::SchemaBuilder;

let schema = SchemaBuilder::new()
    .float64("salary")
    .build();

pub fn boolean(self, name: &str) -> Self

Add a Boolean column (nullable by default)

Example

use dbx_core::SchemaBuilder;

let schema = SchemaBuilder::new()
    .boolean("is_active")
    .build();

pub fn timestamp(self, name: &str) -> Self

Add a Timestamp column (nullable by default)

Example

use dbx_core::SchemaBuilder;

let schema = SchemaBuilder::new()
    .timestamp("created_at")
    .build();

pub fn nullable(self) -> Self

Make the last added field nullable

Example

use dbx_core::SchemaBuilder;

let schema = SchemaBuilder::new()
    .int32("age").nullable()
    .build();

pub fn not_null(self) -> Self

Make the last added field NOT NULL

Example

use dbx_core::SchemaBuilder;

let schema = SchemaBuilder::new()
    .text("email").not_null()
    .build();

Trait Implementations

impl Clone for SchemaBuilder

fn clone(&self) -> SchemaBuilder

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SchemaBuilder

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for SchemaBuilder

fn default() -> Self

Returns the “default value” for a type.