可以使用此查询将基础数据中的“null”解释为空字符串。

SELECT TRANSLATE(column1,'NULL','') FROM MyTable;

插图：

-- This is the Hive table

> desc hive_tbl;

col_name                data_type
h1                      string
h2                      string
h3                      string
h4                      string

-- This is the query that interprets h2 having 'NULL' as another character. 
-- In this case, 'X' is used instead of '' so that it prints in the display.

> SELECT h1, h2, h3, h4, TRANSLATE(h2,'NULL','X') h2_updated FROM hive_tbl;

h1  h2      h3  h4                                                h2_updated
1   foo     100 entry-foo                                         foo
2   NULL    200 The data is absent for second column              NULL
3   NULL    300 The value in second column is the string NULL     X