Function parse_generated_expr

nodedb-query/src/expr_parse/parser.rs:30–51

Parse a SQL expression string into an SqlExpr AST. Returns the parsed expression and a list of column names it references (the `depends_on` set for generated columns).

(text: &str)

/// Returns the parsed expression and a list of column names it references
/// (the `depends_on` set for generated columns).
pub fn parse_generated_expr(text: &str) -> Result<(SqlExpr, Vec<String>), ExprParseError> {
    let tokens = tokenize(text)?;
    let mut pos = 0;
    let expr = parse_expr(&tokens, &mut pos, &mut 0)?;
    if pos < tokens.len() {
        return Err(ExprParseError::UnexpectedToken {
            found: tokens[pos].text.clone(),
            pos,
        });
    }

    // Validate determinism.
    validate_deterministic(&expr)?;

    // Collect column references.
    let mut deps = Vec::new();
    collect_columns(&expr, &mut deps);
    deps.sort();
    deps.dedup();

    Ok((expr, deps))
}

// ── Recursive descent parser ──────────────────────────────────────────