hive concat_ws空值

在Hive中，concat_ws函数用于将多个字符串连接在一起，如果存在空值，则返回非空的拼接。例如，在concat_ws('_',null,'c',null,'d')这个例子中，函数会忽略空值，返回结果为"c_d"。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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