Struct TableMetadata

Source

pub struct TableMetadata {
    pub table_id: u32,
    pub name: String,
    pub columns: Vec<ColumnMetadata>,
    pub primary_key: Option<Vec<String>>,
    pub storage_options: StorageOptions,
}

Expand description

Metadata for a table in the catalog.

Contains the table ID, name, column definitions, and optional primary key constraint.

§Examples

use alopex_sql::catalog::{TableMetadata, ColumnMetadata};
use alopex_sql::planner::types::ResolvedType;

let columns = vec![
    ColumnMetadata::new("id", ResolvedType::Integer)
        .with_primary_key(true)
        .with_not_null(true),
    ColumnMetadata::new("name", ResolvedType::Text)
        .with_not_null(true),
];

let table = TableMetadata::new("users", columns)
    .with_primary_key(vec!["id".to_string()]);

assert_eq!(table.name, "users");
assert!(table.get_column("id").is_some());
assert_eq!(table.column_names(), vec!["id", "name"]);

Fields§

§table_id: u32

Unique table ID assigned by the catalog.

§name: String

Table name.

§columns: Vec<ColumnMetadata>

Column definitions (order is preserved).

§primary_key: Option<Vec<String>>

Primary key columns (supports composite keys).

§storage_options: StorageOptions

Storage configuration (row/columnar, compression, row group sizing).

Implementations§

Source §

impl TableMetadata

Source

pub fn new(name: impl Into<String>, columns: Vec<ColumnMetadata>) -> Self

Create a new table metadata with the given name and columns.

The table_id defaults to 0; use with_table_id() to set it, or it will be assigned by the Catalog when the table is created.

Source

pub fn with_table_id(self, table_id: u32) -> Self

Set the table ID.

Source

pub fn with_primary_key(self, columns: Vec<String>) -> Self

Set the primary key columns.

Source

pub fn get_column(&self, name: &str) -> Option<&ColumnMetadata>

Get a column by name.

Returns None if the column doesn’t exist.

§Examples

use alopex_sql::catalog::{TableMetadata, ColumnMetadata};
use alopex_sql::planner::types::ResolvedType;

let table = TableMetadata::new("users", vec![
    ColumnMetadata::new("id", ResolvedType::Integer),
    ColumnMetadata::new("name", ResolvedType::Text),
]);

assert!(table.get_column("id").is_some());
assert!(table.get_column("unknown").is_none());

Source

pub fn get_column_index(&self, name: &str) -> Option<usize>

Get the index of a column by name.

Returns None if the column doesn’t exist.

Source

pub fn column_names(&self) -> Vec<&str>

Get a list of all column names in definition order.

§Examples

use alopex_sql::catalog::{TableMetadata, ColumnMetadata};
use alopex_sql::planner::types::ResolvedType;

let table = TableMetadata::new("users", vec![
    ColumnMetadata::new("id", ResolvedType::Integer),
    ColumnMetadata::new("name", ResolvedType::Text),
    ColumnMetadata::new("age", ResolvedType::Integer),
]);

assert_eq!(table.column_names(), vec!["id", "name", "age"]);