parse "<table>/<tag>" "<table>/<tag>#column" "<table>/<tag>#function()" "<table>/<tag>#function(<column>)" "<table>/<tag>#func2(func1())" "<table>/<tag>#func2(func1(<column>))".

chunk.

const.

"mean", "variance", "cdf", "quantile", "stddev", "stderr", "entropy", "mode".

count, avg, rss, rms.

"moment".

lrs, correlation, covariance.

first, last, min, max, sum.

timewindow.

A histogram bin for a value in range [low, high).

- avg average - rss root sum square - rms root mean square.

first, last, min, max, sum.

time.