[querier] introduce RepeatList class, used to optimize size of data returned for result set description
When rql query has no ambiguity, we used to return the same description * N
where N is the size of the result set. Returning RepeatList class avoid
that multiplication.
According to quick benchmark this improve performance for result set whose
size is ~ > 50, has very small penalty for rset < 50, and in any case improve
the size of data to be transfered over the network through pyro connection.
function datetuple(d) {
return [d.getFullYear(), d.getMonth()+1, d.getDate(),
d.getHours(), d.getMinutes()];
}
function pprint(obj) {
print('{');
for(k in obj) {
print(' ' + k + ' = ' + obj[k]);
}
print('}');
}
function arrayrepr(array) {
return '[' + array.join(', ') + ']';
}
function assertArrayEquals(array1, array2) {
if (array1.length != array2.length) {
throw new crosscheck.AssertionFailure(array1.join(', ') + ' != ' + array2.join(', '));
}
for (var i=0; i<array1.length; i++) {
if (array1[i] != array2[i]) {
throw new crosscheck.AssertionFailure(arrayrepr(array1) + ' and ' + arrayrepr(array2)
+ ' differs at index ' + i);
}
}
}