Function selectExact

docs/app/js/sanddance-app.js:10302–10310

(column, value)

    return searchExpression;
}
function selectExact(column, value) {
    if (value == null) return selectNullOrEmpty(column);
    const searchExpression = {
        name: column.name,
        operator: "==",
        value
    };
    return searchExpression;
}
function selectNone(column, values) {
    const expressions = values.map((value, i)=>{
        const searchExpression = {