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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2000-10-05 19:11:39 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2000-10-05 19:11:39 +0000 |
| commit | 05e3d0ee8666b74f11ffad16f46e372459d6e53e (patch) | |
| tree | b273892bfda60f6bad315e84aaa2e9826e226931 /src/backend/commands/explain.c | |
| parent | 5292637f52c6db8a22f99177f228273cb69fc510 (diff) | |
| download | postgresql-05e3d0ee8666b74f11ffad16f46e372459d6e53e.tar.gz postgresql-05e3d0ee8666b74f11ffad16f46e372459d6e53e.zip | |
Reimplementation of UNION/INTERSECT/EXCEPT. INTERSECT/EXCEPT now meet the
SQL92 semantics, including support for ALL option. All three can be used
in subqueries and views. DISTINCT and ORDER BY work now in views, too.
This rewrite fixes many problems with cross-datatype UNIONs and INSERT/SELECT
where the SELECT yields different datatypes than the INSERT needs. I did
that by making UNION subqueries and SELECT in INSERT be treated like
subselects-in-FROM, thereby allowing an extra level of targetlist where the
datatype conversions can be inserted safely.
INITDB NEEDED!
Diffstat (limited to 'src/backend/commands/explain.c')
| -rw-r--r-- | src/backend/commands/explain.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/src/backend/commands/explain.c b/src/backend/commands/explain.c index 25b7517e1ec..f98ca70514f 100644 --- a/src/backend/commands/explain.c +++ b/src/backend/commands/explain.c @@ -5,7 +5,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994-5, Regents of the University of California * - * $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.59 2000/09/29 18:21:26 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.60 2000/10/05 19:11:26 tgl Exp $ * */ @@ -197,6 +197,26 @@ explain_outNode(StringInfo str, Plan *plan, int indent, ExplainState *es) case T_Unique: pname = "Unique"; break; + case T_SetOp: + switch (((SetOp *) plan)->cmd) + { + case SETOPCMD_INTERSECT: + pname = "SetOp Intersect"; + break; + case SETOPCMD_INTERSECT_ALL: + pname = "SetOp Intersect All"; + break; + case SETOPCMD_EXCEPT: + pname = "SetOp Except"; + break; + case SETOPCMD_EXCEPT_ALL: + pname = "SetOp Except All"; + break; + default: + pname = "SetOp ???"; + break; + } + break; case T_Hash: pname = "Hash"; break; @@ -320,8 +340,6 @@ explain_outNode(StringInfo str, Plan *plan, int indent, ExplainState *es) Assert(rtentry != NULL); rt_store(appendplan->inheritrelid, es->rtable, rtentry); } - else - es->rtable = nth(whichplan, appendplan->unionrtables); for (i = 0; i < indent; i++) appendStringInfo(str, " "); |