diff options
Diffstat (limited to 'src/include/postgres.h')
| -rw-r--r-- | src/include/postgres.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/include/postgres.h b/src/include/postgres.h index 446bb44b711..057a3413acd 100644 --- a/src/include/postgres.h +++ b/src/include/postgres.h @@ -366,6 +366,21 @@ typedef struct typedef uintptr_t Datum; +/* + * A NullableDatum is used in places where both a Datum and its nullness needs + * to be stored. This can be more efficient than storing datums and nullness + * in separate arrays, due to better spatial locality, even if more space may + * be wasted due to padding. + */ +typedef struct NullableDatum +{ +#define FIELDNO_NULLABLE_DATUM_DATUM 0 + Datum value; +#define FIELDNO_NULLABLE_DATUM_ISNULL 1 + bool isnull; + /* due to alignment padding this could be used for flags for free */ +} NullableDatum; + #define SIZEOF_DATUM SIZEOF_VOID_P /* |