Is there anyone can tell me when the function propagate_cond_constants() will be
really used? Cause I found after the build_equal_items(), all Item_func::EQ_FUNC
are transformed to Item_func::MULT_EQUAL_FUNC.
And the example in mysql internals 188.8.131.52. Constant Propagation, just refer
to propagate_cond_constants(), but all translate are really finished
So I want to know when the function propagate_cond_constants() will really work? It's
kind of you to supply an example.
Thank you very much.