diff options
Diffstat (limited to 'src/mongo/db/update/log_builder.h')
| -rw-r--r-- | src/mongo/db/update/log_builder.h | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/src/mongo/db/update/log_builder.h b/src/mongo/db/update/log_builder.h index 9d7b1954365..60287ecfa92 100644 --- a/src/mongo/db/update/log_builder.h +++ b/src/mongo/db/update/log_builder.h @@ -34,17 +34,12 @@ namespace mongo { /** - * There are two update subsystems in MongoDB with slightly different semantics. + * Previously, there were multiple supported versions of the update language. */ enum class UpdateSemantics { - // The update system that was in use up until v3.4, which is implemented in ModifierInterface - // and its subclasses. When a single update adds multiple fields, those fields are added in the - // same order as they are specified in the update document. - kModifierInterface = 0, - - // The update system introduced in v3.6, which is implemented in UpdateNode and its subclassees. - // When a single update adds multiple fields, those fields are added in lexicographic order by - // field name. This system introduces support for arrayFilters and $[] syntax. + // The update system introduced in v3.6, and is the only supported system. When a single update + // adds multiple fields, those fields are added in lexicographic order by field name. This + // system introduces support for arrayFilters and $[] syntax. kUpdateNode = 1, // Must be last. |