The WITH ORDINALITY clause causes UNNEST to generate an additional column of type integer that contains the position associated with each element.
WITH ORDINALITY子句使UNNEST生成另一个整数类型的列，包含与每一个元素关联的位置。
The WITH ORDINALITY clause causes UNNEST to generate an additional column of type integer that contains the position associated with each element.
WITH ORDINALITY子句使UNNEST生成另一个整数类型的列，包含与每一个元素关联的位置。
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