i executed some tests with set profiling=1, execute query, set profiling=0;
with the explain extended, and explain without extended it take ~0.0014s (in my query test, a union query with two queries with two tables and a single join) with extended it take ~0.0019s (increase 0.0005s, 35% of overhead for explain) maybe 0.5ms isn't a bad thing on some queries i will check more about the query rewrite of explain extended, but i think it's not a big problem on some workloads
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