diff options
Diffstat (limited to 'src/include/nodes/primnodes.h')
| -rw-r--r-- | src/include/nodes/primnodes.h | 45 |
1 files changed, 43 insertions, 2 deletions
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h index f7323058251..dc01689e30e 100644 --- a/src/include/nodes/primnodes.h +++ b/src/include/nodes/primnodes.h @@ -10,7 +10,7 @@ * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: primnodes.h,v 1.59 2002/03/21 16:01:48 tgl Exp $ + * $Id: primnodes.h,v 1.60 2002/03/26 19:16:53 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -93,6 +93,47 @@ typedef struct Fjoin } Fjoin; +/* + * Alias - + * specifies an alias for a range variable; the alias might also + * specify renaming of columns within the table. + */ +typedef struct Alias +{ + NodeTag type; + char *aliasname; /* aliased rel name (never qualified) */ + List *colnames; /* optional list of column aliases */ + /* Note: colnames is a list of Value nodes (always strings) */ +} Alias; + +typedef enum InhOption +{ + INH_NO, /* Do NOT scan child tables */ + INH_YES, /* DO scan child tables */ + INH_DEFAULT /* Use current SQL_inheritance option */ +} InhOption; + +/* + * RangeVar - range variable, used in FROM clauses + * + * Also used to represent table names in utility statements; there, the alias + * field is not used, and inhOpt shows whether to apply the operation + * recursively to child tables. In some contexts it is also useful to carry + * a TEMP table indication here. + */ +typedef struct RangeVar +{ + NodeTag type; + char *catalogname; /* the catalog (database) name, or NULL */ + char *schemaname; /* the schema name, or NULL */ + char *relname; /* the relation/sequence name */ + InhOption inhOpt; /* expand rel by inheritance? + * recursively act on children? */ + bool istemp; /* is this a temp relation/sequence? */ + Alias *alias; /* table alias & optional column aliases */ +} RangeVar; + + /* ---------------------------------------------------------------- * node types for executable expressions * ---------------------------------------------------------------- @@ -527,7 +568,7 @@ typedef struct JoinExpr Node *rarg; /* right subtree */ List *using; /* USING clause, if any (list of String) */ Node *quals; /* qualifiers on join, if any */ - struct Alias *alias; /* user-written alias clause, if any */ + Alias *alias; /* user-written alias clause, if any */ int rtindex; /* RT index assigned for join */ } JoinExpr; |