1.explode
hive wiki对于expolde的解释如下：
explode() takes in an array (or a map) as an input and outputs the elements of the array (map) as separate rows. UDTFs can be used in the SELECT expression list and as a part of LATERAL VIEW.ex
阅读背景：
hive lateral view 与 explode详解
来源：互联网
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