MAP_SIZE

説明

Mapの要素数を数える

構文

MAP_SIZE(<map>)

パラメータ

パラメータ	説明
<map>	入力マップの内容

戻り値

Mapの要素数を返します

例

select map_size(map()),map_size(map(1, "100", 0.1, 2));

+-----------------+-------------------------------------------------------------------------------------------------+
| map_size(map()) | map_size(map(cast(1 as DECIMALV3(2, 1)), '100', cast(0.1 as DECIMALV3(2, 1)), cast(2 as TEXT))) |
+-----------------+-------------------------------------------------------------------------------------------------+
|               0 |                                                                                               2 |
+-----------------+-------------------------------------------------------------------------------------------------+