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Commitba3d39c

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Don't allow system columns in CHECK constraints, except tableoid.
Previously, arbitray system columns could be mentioned in tableconstraints, but they were not correctly checked at runtime, becausethe values weren't actually set correctly in the tuple. Since itseems easy enough to initialize the table OID properly, do that,and continue allowing that column, but disallow the rest unless anduntil someone figures out a way to make them work properly.No back-patch, because this doesn't seem important enough to take therisk of destabilizing the back branches. In fact, this will pose adump-and-reload hazard for those upgrading from previous versions:constraints that were accepted before but were not correctly enforcedwill now either be enforced correctly or not accepted at all. Eithercould result in restore failures, but in practice I think very fewusers will notice the difference, since the use case is prettymarginal anyway and few users will be relying on features that havenot historically worked.Amit Kapila, reviewed by Rushabh Lathia, with doc changes by me.
1 parentff2a1f5 commitba3d39c

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7 files changed

+82
-1
lines changed

7 files changed

+82
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lines changed

‎doc/src/sgml/ref/create_table.sgml

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -430,7 +430,8 @@ CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXI
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<para>
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Currently, <literal>CHECK</literal> expressions cannot contain
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subqueries nor refer to variables other than columns of the
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current row.
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current row. The system column <literal>tableoid</literal>
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may be referenced, but not any other system column.
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</para>
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<para>

‎src/backend/commands/copy.c

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2217,6 +2217,12 @@ CopyFrom(CopyState cstate)
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if (loaded_oid!=InvalidOid)
22182218
HeapTupleSetOid(tuple,loaded_oid);
22192219

2220+
/*
2221+
* Constraints might reference the tableoid column, so initialize
2222+
* t_tableOid before evaluating them.
2223+
*/
2224+
tuple->t_tableOid=RelationGetRelid(resultRelInfo->ri_RelationDesc);
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/* Triggers and stuff need to be invoked in query context. */
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MemoryContextSwitchTo(oldcontext);
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‎src/backend/commands/tablecmds.c

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -3857,6 +3857,12 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap, LOCKMODE lockmode)
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/* Preserve OID, if any */
38583858
if (newTupDesc->tdhasoid)
38593859
HeapTupleSetOid(tuple,tupOid);
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/*
3862+
* Constraints might reference the tableoid column, so initialize
3863+
* t_tableOid before evaluating them.
3864+
*/
3865+
tuple->t_tableOid=RelationGetRelid(oldrel);
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}
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/* Now check any constraints on the possibly-changed tuple */

‎src/backend/executor/nodeModifyTable.c

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -246,6 +246,12 @@ ExecInsert(TupleTableSlot *slot,
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}
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else
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{
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/*
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* Constraints might reference the tableoid column, so initialize
251+
* t_tableOid before evaluating them.
252+
*/
253+
tuple->t_tableOid=RelationGetRelid(resultRelationDesc);
254+
249255
/*
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* Check the constraints of the tuple
251257
*/
@@ -653,6 +659,12 @@ ExecUpdate(ItemPointer tupleid,
653659
{
654660
LockTupleModelockmode;
655661

662+
/*
663+
* Constraints might reference the tableoid column, so initialize
664+
* t_tableOid before evaluating them.
665+
*/
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tuple->t_tableOid=RelationGetRelid(resultRelationDesc);
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656668
/*
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* Check the constraints of the tuple
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*

‎src/backend/parser/parse_relation.c

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -551,6 +551,16 @@ scanRTEForColumn(ParseState *pstate, RangeTblEntry *rte, char *colname,
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{
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/* quick check to see if name could be a system column */
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attnum=specialAttNum(colname);
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/* In constraint check, no system column is allowed except tableOid */
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if (pstate->p_expr_kind==EXPR_KIND_CHECK_CONSTRAINT&&
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attnum<InvalidAttrNumber&&attnum!=TableOidAttributeNumber)
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ereport(ERROR,
559+
(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
560+
errmsg("system column \"%s\" reference in check constraint is invalid",
561+
colname),
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parser_errposition(pstate,location)));
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554564
if (attnum!=InvalidAttrNumber)
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{
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/* now check to see if column actually is defined */

‎src/test/regress/input/constraints.source

Lines changed: 22 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -126,6 +126,28 @@ INSERT INTO INSERT_TBL VALUES (null, null, null);
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SELECT '' AS nine, * FROM INSERT_TBL;
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129+
--
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-- Check constraints on system columns
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--
132+
133+
CREATE TABLE SYS_COL_CHECK_TBL (city text, state text, is_capital bool,
134+
altitude int,
135+
CHECK (NOT (is_capital AND tableoid::regclass::text = 'sys_col_check_tbl')));
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137+
INSERT INTO SYS_COL_CHECK_TBL VALUES ('Seattle', 'Washington', false, 100);
138+
INSERT INTO SYS_COL_CHECK_TBL VALUES ('Olympia', 'Washington', true, 100);
139+
140+
SELECT *, tableoid::regclass::text FROM SYS_COL_CHECK_TBL;
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142+
DROP TABLE SYS_COL_CHECK_TBL;
143+
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--
145+
-- Check constraints on system columns other then TableOid should return error
146+
--
147+
CREATE TABLE SYS_COL_CHECK_TBL (city text, state text, is_capital bool,
148+
altitude int,
149+
CHECK (NOT (is_capital AND ctid::text = 'sys_col_check_tbl')));
150+
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--
130152
-- Check inheritance of defaults and constraints
131153
--

‎src/test/regress/output/constraints.source

Lines changed: 24 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -204,6 +204,30 @@ SELECT '' AS nine, * FROM INSERT_TBL;
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| | |
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(7 rows)
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207+
--
208+
-- Check constraints on system columns
209+
--
210+
CREATE TABLE SYS_COL_CHECK_TBL (city text, state text, is_capital bool,
211+
altitude int,
212+
CHECK (NOT (is_capital AND tableoid::regclass::text = 'sys_col_check_tbl')));
213+
INSERT INTO SYS_COL_CHECK_TBL VALUES ('Seattle', 'Washington', false, 100);
214+
INSERT INTO SYS_COL_CHECK_TBL VALUES ('Olympia', 'Washington', true, 100);
215+
ERROR: new row for relation "sys_col_check_tbl" violates check constraint "sys_col_check_tbl_check"
216+
DETAIL: Failing row contains (Olympia, Washington, t, 100).
217+
SELECT *, tableoid::regclass::text FROM SYS_COL_CHECK_TBL;
218+
city | state | is_capital | altitude | tableoid
219+
---------+------------+------------+----------+-------------------
220+
Seattle | Washington | f | 100 | sys_col_check_tbl
221+
(1 row)
222+
223+
DROP TABLE SYS_COL_CHECK_TBL;
224+
--
225+
-- Check constraints on system columns other then TableOid should return error
226+
--
227+
CREATE TABLE SYS_COL_CHECK_TBL (city text, state text, is_capital bool,
228+
altitude int,
229+
CHECK (NOT (is_capital AND ctid::text = 'sys_col_check_tbl')));
230+
ERROR: system column "ctid" reference in check constraint is invalid
207231
--
208232
-- Check inheritance of defaults and constraints
209233
--

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