//! Raw input relations with positional columns.
//!
//! Tables are the input to atom scans. They carry no column names: positions
//! are matched against an [`AtomPattern`](crate::atom::AtomPattern).

use crate::value::Value;

#[derive(Debug, Clone)]
pub struct Table {
    pub arity: usize,
    pub rows: Vec<Vec<Value>>,
}

impl Table {
    #[must_use]
    pub fn new(arity: usize) -> Self {
        Self {
            arity,
            rows: Vec::new(),
        }
    }

    /// # Panics
    /// Panics if `row.len() != self.arity`.
    pub fn push(&mut self, row: Vec<Value>) {
        assert_eq!(
            row.len(),
            self.arity,
            "row arity mismatch: expected {}, got {}",
            self.arity,
            row.len(),
        );
        self.rows.push(row);
    }
}