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@kyanny

Treasure Data (Presto) で Array の要素数を得る

array<any> 型に対して、配列の要素数(長さ)を得るには cardinality という関数を使う。

cardinality(x) → bigint
  Returns the cardinality (size) of the array x.

size とか length とか array_size とか array_length とかは無い。

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