diff options
Diffstat (limited to 'src/include/nodes/primnodes.h')
| -rw-r--r-- | src/include/nodes/primnodes.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h index 60c1ca2c8d..4dbcc10e33 100644 --- a/src/include/nodes/primnodes.h +++ b/src/include/nodes/primnodes.h @@ -341,6 +341,9 @@ typedef struct WindowFunc * reflowerindexpr must be the same length as refupperindexpr when it * is not NIL. * + * In the slice case, individual expressions in the subscript lists can be + * NULL, meaning "substitute the array's current lower or upper bound". + * * Note: the result datatype is the element type when fetching a single * element; but it is the array type when doing subarray fetch or either * type of store. @@ -360,7 +363,7 @@ typedef struct ArrayRef List *refupperindexpr;/* expressions that evaluate to upper array * indexes */ List *reflowerindexpr;/* expressions that evaluate to lower array - * indexes */ + * indexes, or NIL for single array element */ Expr *refexpr; /* the expression that evaluates to an array * value */ Expr *refassgnexpr; /* expression for the source value, or NULL if |