Answer: FLATTEN

The FLATTEN function with the RECURSIVE argument is specifically designed to traverse and extract all nested elements from semi-structured data in Snowflake, including retrieving all keys and paths from nested objects. The community discussion shows unanimous agreement (100% votes for A) with references to Snowflake documentation confirming that FLATTEN with RECURSIVE is the correct function for listing distinct key names in all nested elements. GET_PATH is for extracting specific values, CHECK_JSON validates JSON format, and PARSE_JSON converts strings to JSON objects - none of these functions traverse nested structures to list all keys like FLATTEN does.

Author: LeetQuiz Editorial Team