Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

Commitab2f783

Browse files
committed
Fix core dump in transformValuesClause when there are no columns.
The parser code that transformed VALUES from row-oriented tocolumn-oriented lists failed if there were zero columns.You can't write that straightforwardly (though probably youshould be able to), but the case can be reached by expandinga "tab.*" reference to a zero-column table.Per bug #17477 from Wang Ke. Back-patch to all supported branches.Discussion:https://postgr.es/m/17477-0af3c6ac6b0a6ae0@postgresql.org
1 parent9b5797c commitab2f783

File tree

3 files changed

+18
-12
lines changed

3 files changed

+18
-12
lines changed

‎src/backend/parser/analyze.c

Lines changed: 6 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -1381,7 +1381,7 @@ static Query *
13811381
transformValuesClause(ParseState*pstate,SelectStmt*stmt)
13821382
{
13831383
Query*qry=makeNode(Query);
1384-
List*exprsLists;
1384+
List*exprsLists=NIL;
13851385
List*coltypes=NIL;
13861386
List*coltypmods=NIL;
13871387
List*colcollations=NIL;
@@ -1465,6 +1465,9 @@ transformValuesClause(ParseState *pstate, SelectStmt *stmt)
14651465

14661466
/* Release sub-list's cells to save memory */
14671467
list_free(sublist);
1468+
1469+
/* Prepare an exprsLists element for this row */
1470+
exprsLists=lappend(exprsLists,NIL);
14681471
}
14691472

14701473
/*
@@ -1508,24 +1511,15 @@ transformValuesClause(ParseState *pstate, SelectStmt *stmt)
15081511
/*
15091512
* Finally, rearrange the coerced expressions into row-organized lists.
15101513
*/
1511-
exprsLists=NIL;
1512-
foreach(lc,colexprs[0])
1513-
{
1514-
Node*col= (Node*)lfirst(lc);
1515-
List*sublist;
1516-
1517-
sublist=list_make1(col);
1518-
exprsLists=lappend(exprsLists,sublist);
1519-
}
1520-
list_free(colexprs[0]);
1521-
for (i=1;i<sublist_length;i++)
1514+
for (i=0;i<sublist_length;i++)
15221515
{
15231516
forboth(lc,colexprs[i],lc2,exprsLists)
15241517
{
15251518
Node*col= (Node*)lfirst(lc);
15261519
List*sublist=lfirst(lc2);
15271520

15281521
sublist=lappend(sublist,col);
1522+
lfirst(lc2)=sublist;
15291523
}
15301524
list_free(colexprs[i]);
15311525
}

‎src/test/regress/expected/select.out

Lines changed: 7 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -517,6 +517,13 @@ TABLE int8_tbl;
517517
4567890123456789 | -4567890123456789
518518
(9 rows)
519519

520+
-- corner case: VALUES with no columns
521+
CREATE TEMP TABLE nocols();
522+
INSERT INTO nocols DEFAULT VALUES;
523+
SELECT * FROM nocols n, LATERAL (VALUES(n.*)) v;
524+
--
525+
(1 row)
526+
520527
--
521528
-- Test ORDER BY options
522529
--

‎src/test/regress/sql/select.sql

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -148,6 +148,11 @@ SELECT 2+2, 57
148148
UNION ALL
149149
TABLE int8_tbl;
150150

151+
-- corner case: VALUES with no columns
152+
CREATE TEMP TABLE nocols();
153+
INSERT INTO nocols DEFAULTVALUES;
154+
SELECT*FROM nocols n, LATERAL (VALUES(n.*)) v;
155+
151156
--
152157
-- Test ORDER BY options
153158
--

0 commit comments

Comments
 (0)
[8]ページ先頭
©2009-2025 Movatter.jp