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Commit66392d3

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Add p_names field to ParseNamespaceItem
ParseNamespaceItem had a wired-in assumption that p_rte->erefdescribes the table and column aliases exposed by the nsitem. Thisrelaxes this by creating a separate p_names field in an nsitem. Thisis mainly preparation for a patch for JOIN USING aliases, but it savesone indirection in common code paths, so it's possibly a win on itsown.Author: Tom Lane <tgl@sss.pgh.pa.us>Discussion:https://www.postgresql.org/message-id/785329.1616455091@sss.pgh.pa.us
1 parent91c5a8c commit66392d3

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3 files changed

+28
-17
lines changed

3 files changed

+28
-17
lines changed

‎src/backend/parser/parse_clause.c

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1217,9 +1217,9 @@ transformFromClauseItem(ParseState *pstate, Node *n,
12171217
* input column numbers more easily.
12181218
*/
12191219
l_nscolumns=l_nsitem->p_nscolumns;
1220-
l_colnames=l_nsitem->p_rte->eref->colnames;
1220+
l_colnames=l_nsitem->p_names->colnames;
12211221
r_nscolumns=r_nsitem->p_nscolumns;
1222-
r_colnames=r_nsitem->p_rte->eref->colnames;
1222+
r_colnames=r_nsitem->p_names->colnames;
12231223

12241224
/*
12251225
* Natural join does not explicitly specify columns; must generate
@@ -1469,7 +1469,7 @@ transformFromClauseItem(ParseState *pstate, Node *n,
14691469
* Now that we know the join RTE's rangetable index, we can fix up the
14701470
* res_nscolumns data in places where it should contain that.
14711471
*/
1472-
Assert(res_colindex==list_length(nsitem->p_rte->eref->colnames));
1472+
Assert(res_colindex==list_length(nsitem->p_names->colnames));
14731473
for (k=0;k<res_colindex;k++)
14741474
{
14751475
ParseNamespaceColumn*nscol=res_nscolumns+k;

‎src/backend/parser/parse_relation.c

Lines changed: 17 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -65,6 +65,7 @@ static ParseNamespaceItem *scanNameSpaceForRelid(ParseState *pstate, Oid relid,
6565
staticvoidcheck_lateral_ref_ok(ParseState*pstate,ParseNamespaceItem*nsitem,
6666
intlocation);
6767
staticintscanRTEForColumn(ParseState*pstate,RangeTblEntry*rte,
68+
Alias*eref,
6869
constchar*colname,intlocation,
6970
intfuzzy_rte_penalty,
7071
FuzzyAttrMatchState*fuzzystate);
@@ -184,7 +185,6 @@ scanNameSpaceForRefname(ParseState *pstate, const char *refname, int location)
184185
foreach(l,pstate->p_namespace)
185186
{
186187
ParseNamespaceItem*nsitem= (ParseNamespaceItem*)lfirst(l);
187-
RangeTblEntry*rte=nsitem->p_rte;
188188

189189
/* Ignore columns-only items */
190190
if (!nsitem->p_rel_visible)
@@ -193,7 +193,7 @@ scanNameSpaceForRefname(ParseState *pstate, const char *refname, int location)
193193
if (nsitem->p_lateral_only&& !pstate->p_lateral_active)
194194
continue;
195195

196-
if (strcmp(rte->eref->aliasname,refname)==0)
196+
if (strcmp(nsitem->p_names->aliasname,refname)==0)
197197
{
198198
if (result)
199199
ereport(ERROR,
@@ -420,7 +420,7 @@ checkNameSpaceConflicts(ParseState *pstate, List *namespace1,
420420
{
421421
ParseNamespaceItem*nsitem1= (ParseNamespaceItem*)lfirst(l1);
422422
RangeTblEntry*rte1=nsitem1->p_rte;
423-
constchar*aliasname1=rte1->eref->aliasname;
423+
constchar*aliasname1=nsitem1->p_names->aliasname;
424424
ListCell*l2;
425425

426426
if (!nsitem1->p_rel_visible)
@@ -430,10 +430,11 @@ checkNameSpaceConflicts(ParseState *pstate, List *namespace1,
430430
{
431431
ParseNamespaceItem*nsitem2= (ParseNamespaceItem*)lfirst(l2);
432432
RangeTblEntry*rte2=nsitem2->p_rte;
433+
constchar*aliasname2=nsitem2->p_names->aliasname;
433434

434435
if (!nsitem2->p_rel_visible)
435436
continue;
436-
if (strcmp(rte2->eref->aliasname,aliasname1)!=0)
437+
if (strcmp(aliasname2,aliasname1)!=0)
437438
continue;/* definitely no conflict */
438439
if (rte1->rtekind==RTE_RELATION&&rte1->alias==NULL&&
439440
rte2->rtekind==RTE_RELATION&&rte2->alias==NULL&&
@@ -466,7 +467,7 @@ check_lateral_ref_ok(ParseState *pstate, ParseNamespaceItem *nsitem,
466467
{
467468
/* SQL:2008 demands this be an error, not an invisible item */
468469
RangeTblEntry*rte=nsitem->p_rte;
469-
char*refname=rte->eref->aliasname;
470+
char*refname=nsitem->p_names->aliasname;
470471

471472
ereport(ERROR,
472473
(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
@@ -672,10 +673,10 @@ scanNSItemForColumn(ParseState *pstate, ParseNamespaceItem *nsitem,
672673
Var*var;
673674

674675
/*
675-
* Scan theRTE's column names (or aliases) for a match. Complain if
676+
* Scan thensitem's column names (or aliases) for a match. Complain if
676677
* multiple matches.
677678
*/
678-
attnum=scanRTEForColumn(pstate,rte,
679+
attnum=scanRTEForColumn(pstate,rte,nsitem->p_names,
679680
colname,location,
680681
0,NULL);
681682

@@ -712,7 +713,7 @@ scanNSItemForColumn(ParseState *pstate, ParseNamespaceItem *nsitem,
712713
(errcode(ERRCODE_UNDEFINED_COLUMN),
713714
errmsg("column \"%s\" of relation \"%s\" does not exist",
714715
colname,
715-
rte->eref->aliasname)));
716+
nsitem->p_names->aliasname)));
716717

717718
var=makeVar(nscol->p_varno,
718719
nscol->p_varattno,
@@ -765,6 +766,7 @@ scanNSItemForColumn(ParseState *pstate, ParseNamespaceItem *nsitem,
765766
*/
766767
staticint
767768
scanRTEForColumn(ParseState*pstate,RangeTblEntry*rte,
769+
Alias*eref,
768770
constchar*colname,intlocation,
769771
intfuzzy_rte_penalty,
770772
FuzzyAttrMatchState*fuzzystate)
@@ -786,7 +788,7 @@ scanRTEForColumn(ParseState *pstate, RangeTblEntry *rte,
786788
* Callers interested in finding match with shortest distance need to
787789
* defend against this directly, though.
788790
*/
789-
foreach(c,rte->eref->colnames)
791+
foreach(c,eref->colnames)
790792
{
791793
constchar*attcolname=strVal(lfirst(c));
792794

@@ -970,7 +972,7 @@ searchRangeTableForCol(ParseState *pstate, const char *alias, const char *colnam
970972
* Scan for a matching column; if we find an exact match, we're
971973
* done. Otherwise, update fuzzystate.
972974
*/
973-
if (scanRTEForColumn(orig_pstate,rte,colname,location,
975+
if (scanRTEForColumn(orig_pstate,rte,rte->eref,colname,location,
974976
fuzzy_rte_penalty,fuzzystate)
975977
&&fuzzy_rte_penalty==0)
976978
{
@@ -1252,6 +1254,7 @@ buildNSItemFromTupleDesc(RangeTblEntry *rte, Index rtindex, TupleDesc tupdesc)
12521254

12531255
/* ... and build the nsitem */
12541256
nsitem= (ParseNamespaceItem*)palloc(sizeof(ParseNamespaceItem));
1257+
nsitem->p_names=rte->eref;
12551258
nsitem->p_rte=rte;
12561259
nsitem->p_rtindex=rtindex;
12571260
nsitem->p_nscolumns=nscolumns;
@@ -1313,6 +1316,7 @@ buildNSItemFromLists(RangeTblEntry *rte, Index rtindex,
13131316

13141317
/* ... and build the nsitem */
13151318
nsitem= (ParseNamespaceItem*)palloc(sizeof(ParseNamespaceItem));
1319+
nsitem->p_names=rte->eref;
13161320
nsitem->p_rte=rte;
13171321
nsitem->p_rtindex=rtindex;
13181322
nsitem->p_nscolumns=nscolumns;
@@ -2198,6 +2202,7 @@ addRangeTableEntryForJoin(ParseState *pstate,
21982202
* list --- caller must do that if appropriate.
21992203
*/
22002204
nsitem= (ParseNamespaceItem*)palloc(sizeof(ParseNamespaceItem));
2205+
nsitem->p_names=rte->eref;
22012206
nsitem->p_rte=rte;
22022207
nsitem->p_rtindex=list_length(pstate->p_rtable);
22032208
nsitem->p_nscolumns=nscolumns;
@@ -2356,7 +2361,7 @@ addRangeTableEntryForCTE(ParseState *pstate,
23562361
*/
23572362
if (rte->ctelevelsup>0)
23582363
for (inti=0;i<n_dontexpand_columns;i++)
2359-
psi->p_nscolumns[list_length(psi->p_rte->eref->colnames)-1-i].p_dontexpand= true;
2364+
psi->p_nscolumns[list_length(psi->p_names->colnames)-1-i].p_dontexpand= true;
23602365

23612366
returnpsi;
23622367
}
@@ -3037,7 +3042,7 @@ expandNSItemVars(ParseNamespaceItem *nsitem,
30373042
if (colnames)
30383043
*colnames=NIL;
30393044
colindex=0;
3040-
foreach(lc,nsitem->p_rte->eref->colnames)
3045+
foreach(lc,nsitem->p_names->colnames)
30413046
{
30423047
Value*colnameval= (Value*)lfirst(lc);
30433048
constchar*colname=strVal(colnameval);

‎src/include/parser/parse_node.h

Lines changed: 8 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -227,8 +227,13 @@ struct ParseState
227227
/*
228228
* An element of a namespace list.
229229
*
230+
* p_names contains the table name and column names exposed by this nsitem.
231+
* (Currently, it's always equal to p_rte->eref.)
232+
*
233+
* p_rte and p_rtindex link to the underlying rangetable entry.
234+
*
230235
* The p_nscolumns array contains info showing how to construct Vars
231-
* referencingcorresponding elements oftheRTE'scolnames list.
236+
* referencingthe names appearing inthep_names->colnames list.
232237
*
233238
* Namespace items with p_rel_visible set define which RTEs are accessible by
234239
* qualified names, while those with p_cols_visible set define which RTEs are
@@ -256,9 +261,10 @@ struct ParseState
256261
*/
257262
structParseNamespaceItem
258263
{
264+
Alias*p_names;/* Table and column names */
259265
RangeTblEntry*p_rte;/* The relation's rangetable entry */
260266
intp_rtindex;/* The relation's index in the rangetable */
261-
/* array of same length asp_rte->eref->colnames: */
267+
/* array of same length asp_names->colnames: */
262268
ParseNamespaceColumn*p_nscolumns;/* per-column data */
263269
boolp_rel_visible;/* Relation name is visible? */
264270
boolp_cols_visible;/* Column names visible as unqualified refs? */

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