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add a NOTE to make something clearer

This commit is contained in:
Gavin King 2024-01-22 15:13:55 +01:00
parent 7d08f94429
commit 2f60e08c64
1 changed files with 4 additions and 2 deletions
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6
documentation/src/main/asciidoc/querylanguage/Expressions.adoc
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@ -917,8 +917,6 @@ In case 2, application of the function produces an <<implicit-collection-join,im
The next group of functions always accept a compound path referring to a collection or many-valued association of an entity.
They're interpreted as referring to the collection as a whole.
Application of one of these function produces implicit subquery.
[[collective-collection-functions]]
[cols="15,20,~,^15"]
|===
@ -929,6 +927,7 @@ Application of one of these function produces implicit subquery.
| `keys()` | Maps | The keys of a map, collectively | ✖
| `values()` | Maps | The values of a map, collectively | ✖
|===
Application of one of these function produces an implicit subquery or implicit join.
This query has an implicit join:
@ -946,6 +945,9 @@ This query has an implicit subquery:
select title from Book where 'hibernate' in elements(tags)
----
NOTE: It never makes sense to apply the functions `elements()`, `indices()`, `keys()`, or `values()` to an identification variable or single-valued path expression.
These functions must be applied to a reference to a many-valued path expression.
[discrete]
===== Collection sizes