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| author | Thomas G. Lockhart <lockhart@fourpalms.org> | 2000-02-15 03:38:29 +0000 |
|---|---|---|
| committer | Thomas G. Lockhart <lockhart@fourpalms.org> | 2000-02-15 03:38:29 +0000 |
| commit | a344a6e7b5d7b2b87f33a155c3ef88bdfdce3fd8 (patch) | |
| tree | 78c19baad416cfe014237bc726baff63aff2b150 /src/backend/nodes/equalfuncs.c | |
| parent | 92c8437d8de8efeb5324fcccb0175beec8e66619 (diff) | |
| download | postgresql-a344a6e7b5d7b2b87f33a155c3ef88bdfdce3fd8.tar.gz postgresql-a344a6e7b5d7b2b87f33a155c3ef88bdfdce3fd8.zip | |
Carry column aliases from the parser frontend. Enables queries like
SELECT a FROM t1 tx (a);
Allow join syntax, including queries like
SELECT * FROM t1 NATURAL JOIN t2;
Update RTE structure to hold column aliases in an Attr structure.
Diffstat (limited to 'src/backend/nodes/equalfuncs.c')
| -rw-r--r-- | src/backend/nodes/equalfuncs.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c index 5888f49515e..3ddc8d6c98a 100644 --- a/src/backend/nodes/equalfuncs.c +++ b/src/backend/nodes/equalfuncs.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.59 2000/02/07 04:40:57 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.60 2000/02/15 03:37:08 thomas Exp $ * *------------------------------------------------------------------------- */ @@ -96,6 +96,17 @@ _equalExpr(Expr *a, Expr *b) } static bool +_equalAttr(Attr *a, Attr *b) +{ + if (!strcmp(a->relname, b->relname)) + return false; + if (length(a->attrs) != length(b->attrs)) + return false; + + return equal(a->attrs, b->attrs); +} + +static bool _equalVar(Var *a, Var *b) { if (a->varno != b->varno) @@ -633,14 +644,14 @@ _equalRangeTblEntry(RangeTblEntry *a, RangeTblEntry *b) if (a->relname != b->relname) return false; } - if (a->refname && b->refname) + if (a->ref && b->ref) { - if (strcmp(a->refname, b->refname) != 0) + if (! equal(a->ref, b->ref)) return false; } else { - if (a->refname != b->refname) + if (a->ref != b->ref) return false; } if (a->relid != b->relid) @@ -845,6 +856,9 @@ equal(void *a, void *b) case T_EState: retval = _equalEState(a, b); break; + case T_Attr: + retval = _equalAttr(a, b); + break; case T_Integer: case T_String: case T_Float: |