Request is for SPLIT_PART to support negative indexes i.e. support right to left searching.
See Snowflake documentation for details: https://docs.snowflake.net/manuals/sql-reference/functions/split_part.html
partNr: Requested part of the split (1-based). 0 is treated as 1. If the value is negative, the parts are counted from the right side of the string.