The string_split function splits a target string into substrings based on the specified separator and returns a substring list.

Description

string_split(target, separator)

**Table 1** string_split parameters
Parameter	Type	Description
target	STRING	Target string to be processed NOTE: If target is NULL, an empty line is returned. If target contains two or more consecutive separators, an empty substring is returned. If target does not contain a specified separator, the original string passed to target is returned.
separator	VARCHAR	Delimiter. Currently, only single-character delimiters are supported.

Example

Prepare test input data.
Table 2 Source table disSource
target (STRING)

separator (VARCHAR)

test-flink

-

flink

-

one-two-ww-three

-

**Table 2** Source table disSource
target (STRING)	separator (VARCHAR)
test-flink	-
flink	-
one-two-ww-three	-

Write test SQL statements.

create table disSource(
  target STRING,
  separator  VARCHAR
) with (
  "connector.type" = "dis",
  "connector.region" = "xxx",
  "connector.channel" = "ygj-dis-in",
  "format.type" = 'csv'
);

create table disSink(
  target STRING,
  item STRING
) with (
  'connector.type' = 'dis',
  'connector.region' = 'xxx',
  'connector.channel' = 'ygj-dis-out',
  'format.type' = 'csv'
);

insert into
  disSink
select
  target,
  item
from
  disSource,
lateral table(string_split(target, separator)) as T(item);

Check test results.

**Table 3** disSink result table
target (STRING)	item (STRING)
test-flink	test
test-flink	flink
flink	flink
one-two-ww-three	one
one-two-ww-three	two
one-two-ww-three	ww
one-two-ww-three	three