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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!
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@ -5,7 +5,7 @@
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994-5, Regents of the University of California
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*
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* $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.59 2000/09/29 18:21:26 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.60 2000/10/05 19:11:26 tgl Exp $
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*
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*/
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@ -197,6 +197,26 @@ explain_outNode(StringInfo str, Plan *plan, int indent, ExplainState *es)
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case T_Unique:
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pname = "Unique";
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break;
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case T_SetOp:
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switch (((SetOp *) plan)->cmd)
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{
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case SETOPCMD_INTERSECT:
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pname = "SetOp Intersect";
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break;
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case SETOPCMD_INTERSECT_ALL:
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pname = "SetOp Intersect All";
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break;
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case SETOPCMD_EXCEPT:
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pname = "SetOp Except";
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break;
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case SETOPCMD_EXCEPT_ALL:
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pname = "SetOp Except All";
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break;
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default:
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pname = "SetOp ???";
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break;
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}
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break;
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case T_Hash:
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pname = "Hash";
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break;
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@ -320,8 +340,6 @@ explain_outNode(StringInfo str, Plan *plan, int indent, ExplainState *es)
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Assert(rtentry != NULL);
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rt_store(appendplan->inheritrelid, es->rtable, rtentry);
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}
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else
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es->rtable = nth(whichplan, appendplan->unionrtables);
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for (i = 0; i < indent; i++)
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appendStringInfo(str, " ");
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