Function selectExactAxis

docs/tests/v2/es6/js/sanddance.js:148869–148875

(axis, column, i)

}

function selectExactAxis(axis, column, i) {
  const result = tickValue(axis, i);

  if (result.tick) {
    return selectExact(column, result.value);
  }
}

function selectBetween(column, lowValue, highValue, lowOperator = '>=', highOperator = '<') {
  const expressions = [];