This topic describes how to use the SPLIT_INDEX function. This function splits a string into several segments based on the specified delimiter and returns the field at the specified position.

Limits

This function is supported only in Realtime Compute for Apache Flink that uses Ververica Runtime (VVR) 3.0.0 or later.

Syntax

VARCHAR SPLIT_INDEX(VARCHAR str, VARCHAR sep, INT index)

Input parameters

Parameter Data type Description
str VARCHAR The string that you want to split.
sep VARCHAR The delimiter.
index INT The field position. The index starts from 0.
Note If no field is obtained, NULL is returned.
Note If an input parameter is set to NULL, NULL is returned.

Example

  • Test data
    Table 1. T1
    str(VARCHAR) sep(VARCHAR) index(INT)
    Jack,John,Mary , 2
    Jack,John,Mary , 3
    Jack,John,Mary NULL 0
    NULL , 0
  • Test statement 
    SELECT  SPLIT_INDEX(str, sep, index) as var1
FROM T1;
  • Test result
    var1(VARCHAR)
    Mary
    NULL
    NULL
    NULL