size (Function)

Function to return the size of the map.

Syntax

<INT> map:size(<OBJECT> map)

Query Parameters

Name	Description	Default Value	Possible Data Types	Optional	Dynamic
map	The map for which size should be returned.		OBJECT	No	Yes

Example 1

map:size(stockDetails)

The map:size(stockDetails) function is employed to determine the number of key-value pairs present in the stockDetails map. It returns the count as an integer value.

Example 2

CREATE STREAM StockInput (symbol string, price float, volume int, stockDetails object);
CREATE SINK STREAM StockCount (stockDetailsSize int);

@info(name = 'CountStockDetails')
INSERT INTO StockCount
SELECT map:size(stockDetails) AS stockDetailsSize
FROM StockInput WINDOW TUMBLING_LENGTH(10);

In this stream processing example, the StockInput stream is created to provide input data to the query and includes stock details (symbol, price, volume) and a stockDetails map. The StockCount stream is created to collect the output.

The CountStockDetails query processes events from the StockInput stream in batches of 10, each event including a stockDetails map. It employs the map:size(stockDetails) function to calculate the number of key-value pairs present in the stockDetails map for each batch.

The resulting count, referred to as stockDetailsSize, is then inserted into the StockCount stream. Thus, this query continuously counts the number of key-value pairs in the stockDetails map after each batch of events and sends this information to the StockCount stream.