uqa_sql/ast/
indexes.rs

1//
2// Unified Query Algebra
3//
4// Copyright (c) 2023-2026 Cognica, Inc.
5//
6
7//! Typed index keys retain the legacy string encoding for ordinary columns.
8
9use std::borrow::Cow;
10
11use serde::{Deserialize, Serialize};
12
13use super::Expr;
14
15#[derive(Debug, Clone, Serialize, Deserialize)]
16pub struct RenameIndexStmt {
17    pub name: String,
18    pub new_name: String,
19    pub if_exists: bool,
20}
21
22#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
23#[serde(untagged)]
24pub enum IndexKey {
25    Column(String),
26    Expression(Box<Expr>),
27}
28
29impl IndexKey {
30    #[must_use]
31    pub fn from_expression(expression: Expr) -> Self {
32        match expression {
33            Expr::Column(column) => Self::Column(column),
34            other => Self::Expression(Box::new(other)),
35        }
36    }
37
38    #[must_use]
39    pub fn column(&self) -> Option<&str> {
40        match self {
41            Self::Column(column) => Some(column),
42            Self::Expression(_) => None,
43        }
44    }
45
46    #[must_use]
47    pub fn expression(&self) -> Cow<'_, Expr> {
48        match self {
49            Self::Column(column) => Cow::Owned(Expr::Column(column.clone())),
50            Self::Expression(expression) => Cow::Borrowed(expression),
51        }
52    }
53}
54
55impl From<String> for IndexKey {
56    fn from(column: String) -> Self {
57        Self::Column(column)
58    }
59}
60
61impl From<&str> for IndexKey {
62    fn from(column: &str) -> Self {
63        Self::Column(column.into())
64    }
65}
uqa_sql/ast/indexes.rs

uqa_sql/ast/
indexes.rs
