nullsfirst(value: storable or ordering) -> ordering

Specify the ordering as nulls first when processing data.

This is used by ordered windowing functions (like lag and last), ordered aggregation functions (like array_agg) and the sort verb.

Domain

This is a scalar function (calculates a single output value for a single input row).

Categories

• Misc

Examples

sort nullsfirst(foo)

Sort the dataset with nulls first in column foo.

statsby list:array_agg(username, asc(nullsfirst(timestamp))), group_by(hostname)

Lists all users for each host, in order of ascending timestamp with nulls first within each host assuming you have a table with columns timestamp, hostname and username.