Function limit_from_query

nodedb-sql/src/planner/lateral/plan.rs:263–273

Extract the LIMIT value from a query.

(query: &ast::Query)

/// Extract the LIMIT value from a query.
fn limit_from_query(query: &ast::Query) -> Option<usize> {
    match &query.limit_clause {
        Some(ast::LimitClause::LimitOffset { limit, .. }) => {
            limit.as_ref().and_then(expr_as_usize_literal)
        }
        Some(ast::LimitClause::OffsetCommaLimit { limit, .. }) => {
            Some(expr_as_usize_literal(limit).unwrap_or(0))
        }
        None => None,
    }
}

/// Extract a LATERAL alias from a `TableFactor::Derived`.
pub fn lateral_alias_from_factor(factor: &ast::TableFactor) -> Option<String> {