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Commit54a9406

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Do not return NULL for error cases in satisfies_hash_partition().
Since this function is used as a CHECK constraint condition,returning NULL is tantamount to returning TRUE, which would have theeffect of letting in a row that doesn't satisfy the hash condition.Admittedly, the cases for which this is done should be unreachablein practice, but that doesn't make it any less a bad idea. It alsoseems like a dartboard was used to decide which error cases shouldthrow errors as opposed to returning NULL.For the checks for NULL input values, I just switched it to returningfalse. There's some argument that an error would be better; but thecase really should be can't-happen in a generated hash constraint,so it's likely not worth more code for.For the parent-relation-open-failure case, it seems like we mightas well let relation_open throw an error, instead of having animpossible-to-diagnose constraint failure.Back-patch to v11 where this code came in.Discussion:https://postgr.es/m/24067.1605134819@sss.pgh.pa.us
1 parent029fa66 commit54a9406

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2 files changed

+10
-15
lines changed

2 files changed

+10
-15
lines changed

‎src/backend/partitioning/partbounds.c

Lines changed: 7 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -2778,6 +2778,8 @@ compute_partition_hash_value(int partnatts, FmgrInfo *partsupfunc, Oid *partcoll
27782778
*
27792779
* Returns true if remainder produced when this computed single hash value is
27802780
* divided by the given modulus is equal to given remainder, otherwise false.
2781+
* NB: it's important that this never return null, as the constraint machinery
2782+
* would consider that to be a "pass".
27812783
*
27822784
* See get_qual_for_hash() for usage.
27832785
*/
@@ -2802,9 +2804,9 @@ satisfies_hash_partition(PG_FUNCTION_ARGS)
28022804
ColumnsHashData*my_extra;
28032805
uint64rowHash=0;
28042806

2805-
/* Returnnull if the parent OID, modulus, or remainder is NULL. */
2807+
/* Returnfalse if the parent OID, modulus, or remainder is NULL. */
28062808
if (PG_ARGISNULL(0)||PG_ARGISNULL(1)||PG_ARGISNULL(2))
2807-
PG_RETURN_NULL();
2809+
PG_RETURN_BOOL(false);
28082810
parentId=PG_GETARG_OID(0);
28092811
modulus=PG_GETARG_INT32(1);
28102812
remainder=PG_GETARG_INT32(2);
@@ -2833,15 +2835,12 @@ satisfies_hash_partition(PG_FUNCTION_ARGS)
28332835
PartitionKeykey;
28342836
intj;
28352837

2836-
/* Open parent relation and fetch partition keyinfo */
2837-
parent=try_relation_open(parentId,AccessShareLock);
2838-
if (parent==NULL)
2839-
PG_RETURN_NULL();
2838+
/* Open parent relation and fetch partition key info */
2839+
parent=relation_open(parentId,AccessShareLock);
28402840
key=RelationGetPartitionKey(parent);
28412841

28422842
/* Reject parent table that is not hash-partitioned. */
2843-
if (parent->rd_rel->relkind!=RELKIND_PARTITIONED_TABLE||
2844-
key->strategy!=PARTITION_STRATEGY_HASH)
2843+
if (key==NULL||key->strategy!=PARTITION_STRATEGY_HASH)
28452844
ereport(ERROR,
28462845
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
28472846
errmsg("\"%s\" is not a hash partitioned table",

‎src/test/regress/expected/hash_part.out

Lines changed: 3 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -10,11 +10,7 @@ CREATE TABLE mchash1
1010
PARTITION OF mchash FOR VALUES WITH (MODULUS 4, REMAINDER 0);
1111
-- invalid OID, no such table
1212
SELECT satisfies_hash_partition(0, 4, 0, NULL);
13-
satisfies_hash_partition
14-
--------------------------
15-
16-
(1 row)
17-
13+
ERROR: could not open relation with OID 0
1814
-- not partitioned
1915
SELECT satisfies_hash_partition('tenk1'::regclass, 4, 0, NULL);
2016
ERROR: "tenk1" is not a hash partitioned table
@@ -34,14 +30,14 @@ ERROR: remainder for hash partition must be less than modulus
3430
SELECT satisfies_hash_partition('mchash'::regclass, NULL, 0, NULL);
3531
satisfies_hash_partition
3632
--------------------------
37-
33+
f
3834
(1 row)
3935

4036
-- remainder is null
4137
SELECT satisfies_hash_partition('mchash'::regclass, 4, NULL, NULL);
4238
satisfies_hash_partition
4339
--------------------------
44-
40+
f
4541
(1 row)
4642

4743
-- too many arguments

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