What does the coalesce command mean in this Splunk search?

coalesce 複数の値を順番に確認し、最初に NULL 以外となった値を返す関数です。 異なる項目名で同じ

EVAL-parent_process_guid = case(coalesce == null, null(),

coalesce db2 splunk logo Splunk datadog logo Datadog new relic logo New Relic snowflake coalesce · concat · constants · env · format · join · json_decode · json_path

opposite of coalesce  Splunk Inc Varonis Systems Inc Western Digital Corp