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Query Produces Different Results with IGNORE INDEX or Different Optimizer Switches (Doc ID 2751495.1)

Last updated on FEBRUARY 10, 2021

Applies to:

MySQL Server - Version 8.0 to 8.0 [Release 8.0]
Information in this document applies to any platform.


A query which involves JOINs produces different results depending on the use of IGNORE INDEX or changing the optimizer_switch variable to enable/disable mrr, mrr_cost_based, or batched_key_access.


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