看到经常有人问此问题！doc的原话，看到了随手记录下！

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A leading portion of an index is a set of one or more columns that were specified first and consecutively in the list of columns in the CREATE INDEX statement that created the index. Consider this CREATE INDEX statement:

CREATE INDEX comp_ind 
ON table1(x, y, z);

x, xy, and xyz combinations of columns are leading portions of the index
yz, y, and z combinations of columns are not leading portions of the index

ITPub博客

什么是index的leading column（索引的前导列）？

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