This is an optimizer hint.

这是一种优化技巧。

youdao

Listing 16 gives an example of a query where the optimizer is given the hint that the spatial predicate will only have very few qualifying rows.

清单16给出了一个查询例子，在这个查询中，向优化器提示空间谓词只有很少的符合条件的行。

youdao

Listing 16 gives an example of a query where the optimizer is given the hint that the spatial predicate will only have very few qualifying rows.

清单16给出了一个查询例子，在这个查询中，向优化器提示空间谓词只有很少的符合条件的行。

youdao