hive replaceall用法
`REPLACEALL` is a function in Hive that is used to replace all occurrences of a substring in a string with another substring. The basic syntax of `REPLACEALL` function in Hive is as follows:
REPLACEALL(string, pattern, replacement)
Where:
- `string` is the input string where the replacements need to be made.
- `pattern` is the substring that needs to be replaced.
replaceall()- `replacement` is the substring that will be substituted for `pattern` in `string`.
Example:
Suppose we have a table `employees` with a column `full_name` that contains the full names of employees:
+-+
      full_name     
+-+
  John Doe         
  Jane Smith       
  Michael Johnson   
  Sarah Williams   
+-+
If we want to replace the space (" ") between first name and last name with an underscore ("_"), we can use the `REPLACEALL` function as follows:
sql
SELECT REPLACEALL(full_name, " ", "_") as updated_name
FROM employees;
The above query will give the following output:
+-+
    updated_name   
+-+
  John_Doe         
  Jane_Smith       
  Michael_Johnson   
  Sarah_Williams   
+-+
As you can see, the `REPLACEALL` function has replaced all the spaces with underscores in the `full_name` column.

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