1996-07-09 08:22:35 +02:00
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/*-------------------------------------------------------------------------
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*
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1999-02-14 00:22:53 +01:00
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* preptlist.c
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1997-09-07 07:04:48 +02:00
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* Routines to preprocess the parse tree target list
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1996-07-09 08:22:35 +02:00
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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1999-08-21 05:49:17 +02:00
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* $Header: /cvsroot/pgsql/src/backend/optimizer/prep/preptlist.c,v 1.30 1999/08/21 03:49:05 tgl Exp $
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1996-07-09 08:22:35 +02:00
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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1999-07-16 07:00:38 +02:00
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#include "catalog/pg_type.h"
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#include "nodes/makefuncs.h"
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1996-07-09 08:22:35 +02:00
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#include "optimizer/clauses.h"
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1999-07-16 07:00:38 +02:00
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#include "optimizer/prep.h"
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#include "parser/parsetree.h"
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#include "utils/lsyscache.h"
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#include "utils/syscache.h"
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1996-07-09 08:22:35 +02:00
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1998-09-01 06:40:42 +02:00
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static List *expand_targetlist(List *tlist, Oid relid, int command_type,
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1997-09-07 07:04:48 +02:00
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Index result_relation);
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1998-09-01 06:40:42 +02:00
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static List *replace_matching_resname(List *new_tlist,
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1997-09-08 23:56:23 +02:00
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List *old_tlist);
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1998-09-01 06:40:42 +02:00
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static List *new_relation_targetlist(Oid relid, Index rt_index,
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1997-09-07 07:04:48 +02:00
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NodeTag node_type);
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1996-07-09 08:22:35 +02:00
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1997-09-07 07:04:48 +02:00
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/*
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1999-02-14 00:22:53 +01:00
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* preprocess_targetlist
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1997-09-07 07:04:48 +02:00
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* Driver for preprocessing the parse tree targetlist.
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*
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* 1. Deal with appends and replaces by filling missing attributes
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* in the target list.
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* 2. Reset operator OIDs to the appropriate regproc ids.
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*
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* Returns the new targetlist.
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1996-07-09 08:22:35 +02:00
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*/
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1998-02-26 05:46:47 +01:00
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List *
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1997-09-08 23:56:23 +02:00
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preprocess_targetlist(List *tlist,
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1997-09-07 07:04:48 +02:00
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int command_type,
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Index result_relation,
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1997-09-08 23:56:23 +02:00
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List *range_table)
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1996-07-09 08:22:35 +02:00
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{
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1997-09-08 04:41:22 +02:00
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Oid relid = InvalidOid;
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1999-08-09 02:51:26 +02:00
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List *expanded_tlist;
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List *t_list;
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1997-09-07 07:04:48 +02:00
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if (result_relation >= 1 && command_type != CMD_SELECT)
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relid = getrelid(result_relation, range_table);
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/*
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* for heap_formtuple to work, the targetlist must match the exact
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* order of the attributes. We also need to fill in the missing
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* attributes here. -ay 10/94
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*/
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1999-02-03 22:18:02 +01:00
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expanded_tlist = expand_targetlist(tlist, relid, command_type, result_relation);
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1997-09-07 07:04:48 +02:00
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/* XXX should the fix-opids be this early?? */
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1999-08-09 02:51:26 +02:00
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fix_opids(expanded_tlist);
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1997-09-07 07:04:48 +02:00
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t_list = copyObject(expanded_tlist);
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/* ------------------
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* for "replace" or "delete" queries, add ctid of the result
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* relation into the target list so that the ctid can get
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* propogate through the execution and in the end ExecReplace()
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* will find the right tuple to replace or delete. This
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* extra field will be removed in ExecReplace().
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* For convinient, we append this extra field to the end of
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* the target list.
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* ------------------
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*/
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if (command_type == CMD_UPDATE || command_type == CMD_DELETE)
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{
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1997-09-08 04:41:22 +02:00
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TargetEntry *ctid;
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Resdom *resdom;
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Var *var;
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1997-09-07 07:04:48 +02:00
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resdom = makeResdom(length(t_list) + 1,
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1998-07-20 21:21:45 +02:00
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TIDOID,
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1998-02-10 05:02:59 +01:00
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-1,
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1997-09-07 07:04:48 +02:00
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"ctid",
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0,
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0,
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1999-05-17 19:03:51 +02:00
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true);
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1997-09-07 07:04:48 +02:00
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1998-07-20 21:21:45 +02:00
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var = makeVar(result_relation, -1, TIDOID, -1, 0, result_relation, -1);
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1997-09-07 07:04:48 +02:00
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1998-07-20 21:53:53 +02:00
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ctid = makeTargetEntry(resdom, (Node *) var);
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1997-09-07 07:04:48 +02:00
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t_list = lappend(t_list, ctid);
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}
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1998-09-01 05:29:17 +02:00
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return t_list;
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1996-07-09 08:22:35 +02:00
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}
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/*****************************************************************************
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*
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1997-09-07 07:04:48 +02:00
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* TARGETLIST EXPANSION
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1996-07-09 08:22:35 +02:00
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*
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*****************************************************************************/
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1997-09-07 07:04:48 +02:00
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/*
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1999-02-14 00:22:53 +01:00
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* expand_targetlist
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1997-09-07 07:04:48 +02:00
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* Given a target list as generated by the parser and a result relation,
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* add targetlist entries for the attributes which have not been used.
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*
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* XXX This code is only supposed to work with unnested relations.
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*
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* 'tlist' is the original target list
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* 'relid' is the relid of the result relation
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* 'command' is the update command
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*
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1996-07-09 08:22:35 +02:00
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* Returns the expanded target list, sorted in resno order.
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*/
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1997-09-08 04:41:22 +02:00
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static List *
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1997-09-08 23:56:23 +02:00
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expand_targetlist(List *tlist,
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1997-09-07 07:04:48 +02:00
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Oid relid,
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int command_type,
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Index result_relation)
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1996-07-09 08:22:35 +02:00
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{
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1997-09-08 04:41:22 +02:00
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NodeTag node_type = T_Invalid;
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1997-09-07 07:04:48 +02:00
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switch (command_type)
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{
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1997-09-08 04:41:22 +02:00
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case CMD_INSERT:
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node_type = (NodeTag) T_Const;
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break;
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case CMD_UPDATE:
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node_type = (NodeTag) T_Var;
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break;
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1997-09-07 07:04:48 +02:00
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}
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if (node_type != T_Invalid)
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{
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1997-09-08 04:41:22 +02:00
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List *ntlist = new_relation_targetlist(relid,
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result_relation,
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node_type);
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1997-09-07 07:04:48 +02:00
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1998-09-01 05:29:17 +02:00
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return replace_matching_resname(ntlist, tlist);
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1997-09-07 07:04:48 +02:00
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}
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else
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1998-09-01 05:29:17 +02:00
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return tlist;
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1997-09-07 07:04:48 +02:00
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1996-07-09 08:22:35 +02:00
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}
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1997-09-08 04:41:22 +02:00
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static List *
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1997-09-08 23:56:23 +02:00
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replace_matching_resname(List *new_tlist, List *old_tlist)
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1996-07-09 08:22:35 +02:00
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{
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1997-09-08 04:41:22 +02:00
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List *temp,
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*i;
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List *t_list = NIL;
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1997-09-07 07:04:48 +02:00
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foreach(i, new_tlist)
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{
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1997-09-08 04:41:22 +02:00
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TargetEntry *new_tle = (TargetEntry *) lfirst(i);
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TargetEntry *matching_old_tl = NULL;
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1997-09-07 07:04:48 +02:00
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foreach(temp, old_tlist)
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{
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1997-09-08 04:41:22 +02:00
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TargetEntry *old_tle = (TargetEntry *) lfirst(temp);
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1997-09-07 07:04:48 +02:00
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if (!strcmp(old_tle->resdom->resname,
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new_tle->resdom->resname))
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{
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matching_old_tl = old_tle;
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break;
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}
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}
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if (matching_old_tl)
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{
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1999-08-21 05:49:17 +02:00
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/* XXX safe to modify old resdom? */
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1999-02-03 22:18:02 +01:00
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matching_old_tl->resdom->resno = new_tle->resdom->resno;
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1997-09-07 07:04:48 +02:00
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t_list = lappend(t_list, matching_old_tl);
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}
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else
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t_list = lappend(t_list, new_tle);
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1996-07-09 08:22:35 +02:00
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}
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1997-09-07 07:04:48 +02:00
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/*
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* It is possible that 'old_tlist' has some negative attributes (i.e.
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* negative resnos). This only happens if this is a replace/append
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* command and we explicitly specify a system attribute. Of course
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* this is not a very good idea if this is a user query, but on the
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* other hand the rule manager uses this mechanism to replace rule
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* locks.
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*
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* So, copy all these entries to the end of the target list and set their
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1999-05-25 18:15:34 +02:00
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* 'resjunk' value to true to show that these are special attributes
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* and have to be treated specially by the executor!
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1997-09-07 07:04:48 +02:00
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*/
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foreach(temp, old_tlist)
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{
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1997-09-08 04:41:22 +02:00
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TargetEntry *old_tle,
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*new_tl;
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1997-09-07 07:04:48 +02:00
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old_tle = lfirst(temp);
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if (old_tle->resdom->resno < 0)
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{
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1999-08-21 05:49:17 +02:00
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Resdom *newresdom;
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newresdom = (Resdom *) copyObject((Node *) old_tle->resdom);
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newresdom->resno = length(t_list) + 1;
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newresdom->resjunk = true;
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new_tl = makeTargetEntry(newresdom, old_tle->expr);
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1997-09-07 07:04:48 +02:00
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t_list = lappend(t_list, new_tl);
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}
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1999-05-12 17:02:39 +02:00
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/*
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1999-05-25 18:15:34 +02:00
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* Also it is possible that the parser or rewriter added some junk
|
1999-08-21 05:49:17 +02:00
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* attributes to hold ORDER/GROUP BY expressions which are not part of
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1999-05-25 18:15:34 +02:00
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* the result attributes. We can simply identify them by looking
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1999-08-21 05:49:17 +02:00
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* at the ressortgroupref in the TLE's resdom, which is a unique
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* number telling which TLE belongs to which Sort/GroupClause.
|
1999-05-12 17:02:39 +02:00
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*/
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1999-08-21 05:49:17 +02:00
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else if (old_tle->resdom->ressortgroupref > 0)
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1999-05-12 17:02:39 +02:00
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{
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1999-08-21 05:49:17 +02:00
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bool already_there = false;
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1999-05-12 17:02:39 +02:00
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/*
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* Check if the tle is already in the new list
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*/
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foreach(i, t_list)
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{
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1999-08-21 05:49:17 +02:00
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TargetEntry *new_tle = (TargetEntry *) lfirst(i);
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1999-05-12 17:02:39 +02:00
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1999-08-21 05:49:17 +02:00
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if (new_tle->resdom->ressortgroupref ==
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old_tle->resdom->ressortgroupref)
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1999-05-12 17:02:39 +02:00
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{
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1999-08-21 05:49:17 +02:00
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already_there = true;
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1999-05-12 17:02:39 +02:00
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break;
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}
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}
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/*
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* If not, add it and make sure it is now a junk attribute
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*/
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if (!already_there)
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{
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1999-08-21 05:49:17 +02:00
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Resdom *newresdom;
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newresdom = (Resdom *) copyObject((Node *) old_tle->resdom);
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newresdom->resno = length(t_list) + 1;
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newresdom->resjunk = true;
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new_tl = makeTargetEntry(newresdom, old_tle->expr);
|
1999-05-12 17:02:39 +02:00
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t_list = lappend(t_list, new_tl);
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}
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}
|
1996-07-09 08:22:35 +02:00
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}
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|
1998-09-01 05:29:17 +02:00
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return t_list;
|
1996-07-09 08:22:35 +02:00
|
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}
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|
1997-09-07 07:04:48 +02:00
|
|
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/*
|
1999-02-14 00:22:53 +01:00
|
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* new_relation_targetlist
|
1997-09-07 07:04:48 +02:00
|
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* Generate a targetlist for the relation with relation OID 'relid'
|
1999-02-14 00:22:53 +01:00
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* and rangetable index 'rt_index'.
|
1997-09-07 07:04:48 +02:00
|
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*
|
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* Returns the new targetlist.
|
1996-07-09 08:22:35 +02:00
|
|
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*/
|
1997-09-08 04:41:22 +02:00
|
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|
static List *
|
1996-07-09 08:22:35 +02:00
|
|
|
new_relation_targetlist(Oid relid, Index rt_index, NodeTag node_type)
|
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
List *t_list = NIL;
|
1999-05-29 03:48:06 +02:00
|
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|
int natts = get_relnatts(relid);
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AttrNumber attno;
|
1996-07-09 08:22:35 +02:00
|
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|
1999-05-29 03:48:06 +02:00
|
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for (attno = 1; attno <= natts; attno++)
|
1997-09-07 07:04:48 +02:00
|
|
|
{
|
1999-05-29 03:48:06 +02:00
|
|
|
HeapTuple tp;
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|
|
Form_pg_attribute att_tup;
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|
char *attname;
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|
|
Oid atttype;
|
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|
|
int32 atttypmod;
|
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|
|
bool attisset;
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|
|
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|
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tp = SearchSysCacheTuple(ATTNUM,
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|
|
|
ObjectIdGetDatum(relid),
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|
|
UInt16GetDatum(attno),
|
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|
|
0, 0);
|
|
|
|
if (! HeapTupleIsValid(tp))
|
|
|
|
{
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|
|
|
elog(ERROR, "new_relation_targetlist: no attribute tuple %u %d",
|
|
|
|
relid, attno);
|
|
|
|
}
|
|
|
|
att_tup = (Form_pg_attribute) GETSTRUCT(tp);
|
|
|
|
attname = pstrdup(att_tup->attname.data);
|
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|
|
atttype = att_tup->atttypid;
|
|
|
|
atttypmod = att_tup->atttypmod;
|
|
|
|
attisset = att_tup->attisset;
|
1996-07-09 08:22:35 +02:00
|
|
|
|
1997-09-07 07:04:48 +02:00
|
|
|
switch (node_type)
|
|
|
|
{
|
1999-05-29 03:48:06 +02:00
|
|
|
case T_Const: /* INSERT command */
|
1997-09-08 04:41:22 +02:00
|
|
|
{
|
1999-08-09 05:13:31 +02:00
|
|
|
Datum typedefault = get_typdefault(atttype);
|
1999-05-29 03:48:06 +02:00
|
|
|
int typlen;
|
|
|
|
Const *temp_const;
|
|
|
|
TargetEntry *temp_tle;
|
1997-09-08 04:41:22 +02:00
|
|
|
|
1999-08-09 05:13:31 +02:00
|
|
|
if (typedefault == PointerGetDatum(NULL))
|
1999-05-29 03:48:06 +02:00
|
|
|
typlen = 0;
|
1997-09-08 04:41:22 +02:00
|
|
|
else
|
1999-05-29 03:48:06 +02:00
|
|
|
{
|
|
|
|
/*
|
|
|
|
* Since this is an append or replace, the size of
|
|
|
|
* any set attribute is the size of the OID used to
|
|
|
|
* represent it.
|
|
|
|
*/
|
|
|
|
if (attisset)
|
|
|
|
typlen = get_typlen(OIDOID);
|
|
|
|
else
|
|
|
|
typlen = get_typlen(atttype);
|
|
|
|
}
|
|
|
|
|
|
|
|
temp_const = makeConst(atttype,
|
|
|
|
typlen,
|
1999-08-09 05:13:31 +02:00
|
|
|
typedefault,
|
|
|
|
(typedefault == PointerGetDatum(NULL)),
|
1999-05-29 03:48:06 +02:00
|
|
|
false,
|
|
|
|
false, /* not a set */
|
|
|
|
false);
|
|
|
|
|
|
|
|
temp_tle = makeTargetEntry(makeResdom(attno,
|
|
|
|
atttype,
|
|
|
|
-1,
|
|
|
|
attname,
|
|
|
|
0,
|
|
|
|
(Oid) 0,
|
|
|
|
false),
|
|
|
|
(Node *) temp_const);
|
|
|
|
t_list = lappend(t_list, temp_tle);
|
1997-09-08 04:41:22 +02:00
|
|
|
break;
|
|
|
|
}
|
1999-05-29 03:48:06 +02:00
|
|
|
case T_Var: /* UPDATE command */
|
1997-09-08 04:41:22 +02:00
|
|
|
{
|
1999-05-29 03:48:06 +02:00
|
|
|
Var *temp_var;
|
|
|
|
TargetEntry *temp_tle;
|
1997-09-08 04:41:22 +02:00
|
|
|
|
1999-05-29 03:48:06 +02:00
|
|
|
temp_var = makeVar(rt_index, attno, atttype, atttypmod,
|
1999-05-25 18:15:34 +02:00
|
|
|
0, rt_index, attno);
|
1997-09-08 04:41:22 +02:00
|
|
|
|
1999-05-29 03:48:06 +02:00
|
|
|
temp_tle = makeTargetEntry(makeResdom(attno,
|
|
|
|
atttype,
|
|
|
|
atttypmod,
|
|
|
|
attname,
|
|
|
|
0,
|
|
|
|
(Oid) 0,
|
|
|
|
false),
|
|
|
|
(Node *) temp_var);
|
|
|
|
t_list = lappend(t_list, temp_tle);
|
1997-09-08 04:41:22 +02:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
default: /* do nothing */
|
1997-09-07 07:04:48 +02:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
1998-09-01 05:29:17 +02:00
|
|
|
return t_list;
|
1997-09-07 07:04:48 +02:00
|
|
|
}
|