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This PR updated LAST_QUERY_ID with detailed explanations and examples.
Just refactored the document for LAST_QUERY_ID based on my own test results. Key updates includes that the functions accepts both positives & negatives, and how the queries in a session are indexed in either way:
SELECT 1
SELECT 2
SELECT 3
SELECT LAST_QUERY_ID(-2), LAST_QUERY_ID(3)