public void visit(OpConditional opCond) {
Table left = eval(opCond.getLeft());
// Ref engine - don;'t care about efficiency
Table right = eval(opCond.getRight());
Table table = evaluator.condition(left, right);
push(table);
}
// Modularize.
private static Op transformFilterConditional(
ExprList exprs, Set<Var> varScope, OpConditional opConditional) {
// Any filters that depend on no variables.
Op op = insertAnyFilter(exprs, varScope, null);
Op left = opConditional.getLeft();
left = transform(exprs, varScope, left);
Op right = opConditional.getRight();
op = new OpConditional(left, right);
op = insertAnyFilter(exprs, varScope, op);
return op;
}