Aggregate Function
collect_map — aggregate map values into a single map
Synopsis
collect_map(|{any:any}|) -> |{any:any}|
Description
The collect_map aggregate function combines map inputs into a single map output. If collect_map receives multiple values for the same key, the last value received is retained. If the input keys or values vary in type, the return type will be a map of union of those types.
Examples
Combine a sequence of records into a map:
# spq
collect_map(|{stock:price}|)
# input
{stock:"APPL",price:145.03}
{stock:"GOOG",price:87.07}
# expected output
|{"APPL":145.03,"GOOG":87.07}|
Create maps by key:
# spq
collect_map(|{stock:price}|) by day | sort
# input
{stock:"APPL",price:145.03,day:0}
{stock:"GOOG",price:87.07,day:0}
{stock:"APPL",price:150.13,day:1}
{stock:"GOOG",price:89.15,day:1}
# expected output
{day:0,collect_map:|{"APPL":145.03,"GOOG":87.07}|}
{day:1,collect_map:|{"APPL":150.13,"GOOG":89.15}|}