在sparkR中将Null值替换为0

Question

将空值替换为0或任何值

对于数据集测试，我们将列SalesQty null值替换为0

数据集：测试

+---+----+--------+-------------+-------+--------+-----------+
|mon|year|mon_year|location_code|item_no|SalesQty|mmon_year_1|
+---+----+--------+-------------+-------+--------+-----------+
| 11|2012|  112012|         null|   null|    null|       null|
| 11|2012|  112012|         null|   null|    null|       null|
| 11|2012|  112012|         null|   null|    null|       null|
+---+----+--------+-------------+-------+--------+-----------+

test$SalesQty <- when(isNull(test$SalesQty), 0 )

生成的数据集结果：

+---+----+--------+-------------+-------+--------+-----------+
|mon|year|mon_year|location_code|item_no|SalesQty|mmon_year_1|
+---+----+--------+-------------+-------+--------+-----------+
| 11|2012|  112012|         null|   null|    0   |       null|
| 11|2012|  112012|         null|   null|    0   |       null|
| 11|2012|  112012|         null|   null|    0   |       null|
+---+----+--------+-------------+-------+--------+-----------+

Answer 1

“null”是字符串。

test$SalesQty <- ifelse(test$SalesQty == "null", 0, test$SalesQty)