Generate SQL from a condition AST output by sql2ast() or CondParser
function cond2sql(cond, not_first) {
		var result = '';

		// If there is a logical operation
		if (typeof cond.logic != 'undefined') {
			result = cond.terms.map(function (item) {
				return cond2sql(item, true);
			});
			result = result.join(' ' + cond.logic + ' ');
			if (typeof not_first !== 'undefined') result = '(' + result + ')';
		}
		// If there is a condition
		else if (typeof cond.left != 'undefined') {
			result = cond.left;
			if (typeof cond.operator != 'undefined') {
				result += ' ' + cond.operator;
				if (typeof cond.right != 'undefined') {
					if (cond.operator === 'IN') {
						result += ' (' + cond.right + ')';
					}
					else {
						result += ' ' + cond.right;
					}
				}
			}
		}
		// If there is a boolean
		else result = cond;

		return result;
	}