diff options
Diffstat (limited to 'src/include/nodes/parsenodes.h')
| -rw-r--r-- | src/include/nodes/parsenodes.h | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h index ef9f51cb7b0..ab22b737e48 100644 --- a/src/include/nodes/parsenodes.h +++ b/src/include/nodes/parsenodes.h @@ -6,7 +6,7 @@ * * Copyright (c) 1994, Regents of the University of California * - * $Id: parsenodes.h,v 1.76 1999/07/15 23:03:54 momjian Exp $ + * $Id: parsenodes.h,v 1.77 1999/07/18 03:45:01 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -810,14 +810,23 @@ typedef struct A_Indices /* * ResTarget - * result target (used in target list of pre-transformed Parse trees) + * + * In a SELECT or INSERT target list, 'name' is either NULL or + * the column name assigned to the value. (If there is an 'AS ColumnLabel' + * clause, the grammar sets 'name' from it; otherwise 'name' is initially NULL + * and is filled in during the parse analysis phase.) + * The 'indirection' field is not used at all. + * + * In an UPDATE target list, 'name' is the name of the destination column, + * and 'indirection' stores any subscripts attached to the destination. + * That is, our representation is UPDATE table SET name [indirection] = val. */ typedef struct ResTarget { NodeTag type; - char *name; /* name of the result column */ - List *indirection; /* array references */ - Node *val; /* the value of the result (A_Expr or - * Attr) (or A_Const) */ + char *name; /* column name or NULL */ + List *indirection; /* subscripts for destination column, or NIL */ + Node *val; /* the value expression to compute or assign */ } ResTarget; /* |