LATERAL VIEW 子句

适用于:勾选“是” Databricks SQL 勾选“是” Databricks Runtime

与生成器函数(例如 EXPLODE)结合使用,将生成包含一个或多个行的虚拟表。 LATERAL VIEW 将行应用于每个原始输出行。

在 Databricks SQL 中,以及从 Databricks Runtime 12.2 开始,此子句已弃用。 应以 table_reference 的形式调用表值生成器函数。

语法

LATERAL VIEW [ OUTER ] generator_function ( expression [, ...] ) [ table_identifier ] AS column_identifier [, ...]

参数

  • OUTER

    如果指定了 OUTER,则输入数组/映射为空或为 Null 时返回 Null。

  • generator_function

    生成器函数(EXPLODE、INLINE 等)。

  • table_identifier

    generator_function 的别名,它是可选项。

  • column_identifier

    列出列别名 generator_function,它可用于输出行。 列标识符的数目必须与 generator 函数返回的列数匹配。

示例

> CREATE TABLE person (id INT, name STRING, age INT, class INT, address STRING);
> INSERT INTO person VALUES
    (100, 'John', 30, 1, 'Street 1'),
    (200, 'Mary', NULL, 1, 'Street 2'),
    (300, 'Mike', 80, 3, 'Street 3'),
    (400, 'Dan', 50, 4, 'Street 4');

> SELECT * FROM person
    LATERAL VIEW EXPLODE(ARRAY(30, 60)) tableName AS c_age
    LATERAL VIEW EXPLODE(ARRAY(40, 80)) AS d_age;
   id    name     age    class     address    c_age    d_age
 ------ ------- ------- -------- ----------- -------- --------
  100    John    30      1        Street 1    30       40
  100    John    30      1        Street 1    30       80
  100    John    30      1        Street 1    60       40
  100    John    30      1        Street 1    60       80
  200    Mary    NULL    1        Street 2    30       40
  200    Mary    NULL    1        Street 2    30       80
  200    Mary    NULL    1        Street 2    60       40
  200    Mary    NULL    1        Street 2    60       80
  300    Mike    80      3        Street 3    30       40
  300    Mike    80      3        Street 3    30       80
  300    Mike    80      3        Street 3    60       40
  300    Mike    80      3        Street 3    60       80
  400    Dan     50      4        Street 4    30       40
  400    Dan     50      4        Street 4    30       80
  400    Dan     50      4        Street 4    60       40
  400    Dan     50      4        Street 4    60       80

> SELECT c_age, COUNT(1) FROM person
     LATERAL VIEW EXPLODE(ARRAY(30, 60)) AS c_age
     LATERAL VIEW EXPLODE(ARRAY(40, 80)) AS d_age
     GROUP BY c_age;
  c_age    count(1)
 -------- -----------
  60       8
  30       8

SELECT * FROM person
    LATERAL VIEW EXPLODE(ARRAY()) tableName AS c_age;
  id    name    age    class    address    c_age
 ----- ------- ------ -------- ---------- --------

> SELECT * FROM person
     LATERAL VIEW OUTER EXPLODE(ARRAY()) tableName AS c_age;
   id    name     age    class     address    c_age
 ------ ------- ------- -------- ----------- --------
  100    John    30      1        Street 1    NULL
  200    Mary    NULL    1        Street 2    NULL
  300    Mike    80      3        Street 3    NULL
  400    Dan     50      4        Street 4    NULL