@transformer<EOL>def list_concat(input, **params):
PARAM_SOURCE_FIELDS = '<STR_LIT>'<EOL>PARAM_DEST_FIELD = '<STR_LIT>'<EOL>field_list = params.get(PARAM_SOURCE_FIELDS)<EOL>for row in input:<EOL><INDENT>res = []<EOL>for field in field_list:<EOL><INDENT>res += row[field]<EOL><DEDENT>row[params.get(PARAM_DEST_FIELD)] = res<EOL><DEDENT>return input<EOL>
Concatenates two or more lists and put result into dest field
:param input:
:param params:
:return: