collect_map

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:

Query

collect_map(|{stock:price}|)

Input

{stock:"APPL",price:145.03}
{stock:"GOOG",price:87.07}

Result

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Continuous collection over a simple sequence:

Query

yield collect_map(this)

Input

|{"APPL":145.03}|
|{"GOOG":87.07}|
|{"APPL":150.13}|

Result

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Create maps by key:

Query

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}

Result

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