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problem in filesort.cc

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  • problem in filesort.cc

    i am reading code of sort,here is the code that i do not understand very much,my question is what kind of sql is "quick select" ?



    188 if (select && select->quick)
    189 {
    190 status_var_increment(thd-status_var.filesort_range_count);
    191 }
    192 else
    193 {
    194 status_var_increment(thd->status_var.filesort_scan_count);
    195 }
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