`size` function

Applies to: Databricks SQL Databricks Runtime

Returns the cardinality of the array or map in expr.

Syntax

size(expr)

An INTEGER.

注記

In Databricks Runtime, if spark.sql.ansi.enabled is false, size(NULL) returns -1 instead of NULL.

SQL
> SELECT size(array('b', 'd', 'c', 'a'));
 4
> SELECT size(map('a', 1, 'b', 2));
 2
> SELECT size(NULL);
 -1