Help Center/Data Lake Insight/Flink SQL Syntax Reference/Flink OpenSource SQL 1.12 Syntax Reference/Functions/Built-In Functions/Collection Functions
Updated on 2022-09-15 GMT+08:00
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Collection Functions

Description

Table 1 Collection functions

Collection Functions

Description

CARDINALITY(array)

Returns the number of elements in array.

array '[' integer ']'

Returns the element at position INT in array. The index starts from 1.

ELEMENT(array)

Returns the sole element of array (whose cardinality should be one)

Returns NULL if array is empty.

Throws an exception if array has more than one element.

CARDINALITY(map)

Returns the number of entries in map.

map '[' key ']'

Returns the value specified by key value in map.

Parent topic:Built-In Functions