hum, should i use this function in sql_select.cc? remove_eq_conds()
/**
Remove const and eq items. Return new item, or NULL if no condition
cond_value is set to according:
COND_OK query is possible (field = constant)
COND_TRUE always true ( 1 = 1 )
COND_FALSE always false ( 1 = 2 )
SYNPOSIS
remove_eq_conds()
thd THD environment
cond the condition to handle
cond_value the resulting value of the condition
NOTES
calls the inner_remove_eq_conds to check all the tree reqursively
RETURN
*COND with the simplified condition
*/
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