hive substring_index

Hive's `substring_index` function is used to extract a portion of a string based on a specified delimiter and occurrence. It returns the substring that occurs before or after a specified number of occurrences of the delimiter.

The syntax for using `substring_index` in Hive is as follows:

substring_index(string, delimiter, occurrence)

Here's an example to illustrate its usage:

SELECT substring_index('Hello,World,How,Are,You', ',', 2);

In this example, the string `'Hello,World,How,Are,You'` is delimited by commas. The function will return the substring that occurs before or at the 2nd occurrence of the delimiter. The result will be `'Hello,World'`.

You can also use negative numbers for the `occurrence` parameter to count from the end of the string. For example:

SELECT substring_index('Hello,World,How,Are,You', ',', -1);

In this case, the function will return the substring that occurs after or at the last occurrence of the delimiter. The result will be `'You'`.

I hope this helps! Let me know if you have any more questions.