1

我有如下数据。

[{"aref":"4864190760901781","aprd":null},{"aref":null,"aprd":"UC"},{"aref":null,"aprd":null},{"aref ":null,"aprd":null},{"aref":"4864190760905386","aprd":null},{"aref":null,"aprd":"UC"},{"aref":null, "aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760906244","aprd":null},{"aref":null,"aprd":"UC "},{"aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760906269","aprd":null},{"aref ":null,"aprd":"UC"},{"aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760906301","aprd":null},{"aref":null,"aprd":"UC"},{"aref":null,"aprd":null },{"aref":null,"aprd":null},{"aref":"4864190760907010","aprd":null},{"aref":null,"aprd":"UC"},{" aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760907127","aprd":null},{"aref":null," aprd":"UC"},{"aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760908786","aprd":null },{"aref":null,"aprd":"UC"},{"aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760909289","aprd":null},{"aref":null,"aprd":"UC"},{"aref":null," aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760917217","aprd":null},{"aref":null,"aprd":"UC" },{"aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760917514","aprd":null},{"aref" :null,"aprd":"UC"},{"aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760918728"," aprd":null},{"aref":null,"aprd":"UC"},{"aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760928420","aprd":null},{"aref":null,"aprd":"UC"},{"aref" :null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760929006","aprd":null},{"aref":null,"aprd" :"UC"},{"aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760931945","aprd":null}, {"aref":null,"aprd":"UC"},{"aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":" 4864190760933107","aprd":null},{"aref":null,"aprd":"UC"},{"aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760936217","aprd":null},{"aref":null,"aprd":"UC" },{"aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760937835","aprd":null},{"aref" :null,"aprd":"UC"},{"aref":null,"aprd":null},{"aref":null,"aprd":null},{"aref":"4864190760941175"," aprd":null},{"aref":null,"aprd":"UC"},{"aref":null,"aprd":null},{"aref":null,"aprd":null}, {"aref":"4864190760942157","aprd":null},{"aref":null,"aprd":"UC"},{"aref":null,"aprd":null},{"aref":null,"aprd":null}]

如何对我的数据应用 Hive Explode / 横向视图？

我想检索两列 aref & aprd

4

2 回答 2

0

试试这个横向视图爆炸。

 SELECT acol.aref    AS aref, 
           acol.aprd     AS aprd 
    FROM   your_table lateral view explode(yourcol_name) adtable AS acol;
于 2018-08-03T16:45:39.990 回答
0

有关横向视图分解详细信息，请参阅此链接：https ://cwiki.apache.org/confluence/display/Hive/LanguageManual+LateralView

根据您的要求，可能有 2 个答案：

  1. SELECT a.aref AS aref, a.aprd AS aprd FROM table_name LATERAL view EXPLODE(segemnt_colume_name) tablealis AS a;

null在上面的查询输出中，您只会得到在数组列的结构中没有任何值的行。表示类似的值{"aref":null,"aprd":null}不会生成任何行。

  1. SELECT a.aref AS aref,a.aprd AS aprd from table_name LATERAL view OUTER EXPLODE(segemnt_colume_name) tablealis AS a;

在这里，我们在数组列的结构中获取所有行，包括包含空值的行。

于 2018-08-06T09:06:22.717 回答