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Commite82b64a

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Revert "Fix parallel-safety check of expressions and predicate for index builds"
This reverts commiteae7be6, following a discussion with Tom Lane,due to concerns that this impacts the decisions made by the planner forthe number of workers spawned based on the inlining and const-folding ofindex expressions and predicate for cases that would have worked untilthis commit.Discussion:https://postgr.es/m/162802.1709746091@sss.pgh.pa.usBackpatch-through: 12
1 parent3b671dc commite82b64a

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5 files changed

+2
-121
lines changed

5 files changed

+2
-121
lines changed

‎src/backend/optimizer/plan/planner.c‎

Lines changed: 2 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -6143,18 +6143,10 @@ plan_create_index_workers(Oid tableOid, Oid indexOid)
61436143
* Currently, parallel workers can't access the leader's temporary tables.
61446144
* Furthermore, any index predicate or index expressions must be parallel
61456145
* safe.
6146-
*
6147-
* Fetch the list of expressions and predicates directly from the
6148-
* catalogs. Retrieving this information from the relcache would cause
6149-
* the expressions and predicates to be flattened, losing properties that
6150-
* can be important to check if parallel workers can be used. For
6151-
* example, immutable parallel-unsafe functions, that cannot be used in
6152-
* parallel workers, would be changed to Const nodes, that are safe in
6153-
* parallel workers.
61546146
*/
61556147
if (heap->rd_rel->relpersistence==RELPERSISTENCE_TEMP||
6156-
!is_parallel_safe(root, (Node*)get_index_expressions(indexOid))||
6157-
!is_parallel_safe(root, (Node*)get_index_predicate(indexOid)))
6148+
!is_parallel_safe(root, (Node*)RelationGetIndexExpressions(index))||
6149+
!is_parallel_safe(root, (Node*)RelationGetIndexPredicate(index)))
61586150
{
61596151
parallel_workers=0;
61606152
gotodone;

‎src/backend/utils/cache/lsyscache.c‎

Lines changed: 0 additions & 68 deletions
Original file line numberDiff line numberDiff line change
@@ -3510,74 +3510,6 @@ get_index_column_opclass(Oid index_oid, int attno)
35103510
returnopclass;
35113511
}
35123512

3513-
/*
3514-
* get_index_expressions
3515-
*
3516-
*Given the index OID, its a List of its expressions or NIL if none.
3517-
*/
3518-
List*
3519-
get_index_expressions(Oidindex_oid)
3520-
{
3521-
List*result;
3522-
HeapTupletuple;
3523-
DatumexprDatum;
3524-
boolisnull;
3525-
char*exprString;
3526-
3527-
tuple=SearchSysCache1(INDEXRELID,ObjectIdGetDatum(index_oid));
3528-
if (!HeapTupleIsValid(tuple))
3529-
elog(ERROR,"cache lookup failed for index %u",index_oid);
3530-
3531-
exprDatum=SysCacheGetAttr(INDEXRELID,tuple,
3532-
Anum_pg_index_indexprs,&isnull);
3533-
if (isnull)
3534-
{
3535-
ReleaseSysCache(tuple);
3536-
returnNIL;
3537-
}
3538-
3539-
exprString=TextDatumGetCString(exprDatum);
3540-
result= (List*)stringToNode(exprString);
3541-
pfree(exprString);
3542-
ReleaseSysCache(tuple);
3543-
3544-
returnresult;
3545-
}
3546-
3547-
/*
3548-
* get_index_predicate
3549-
*
3550-
*Given the index OID, return a List of its predicate or NIL if none.
3551-
*/
3552-
List*
3553-
get_index_predicate(Oidindex_oid)
3554-
{
3555-
List*result;
3556-
HeapTupletuple;
3557-
DatumpredDatum;
3558-
boolisnull;
3559-
char*predString;
3560-
3561-
tuple=SearchSysCache1(INDEXRELID,ObjectIdGetDatum(index_oid));
3562-
if (!HeapTupleIsValid(tuple))
3563-
elog(ERROR,"cache lookup failed for index %u",index_oid);
3564-
3565-
predDatum=SysCacheGetAttr(INDEXRELID,tuple,
3566-
Anum_pg_index_indpred,&isnull);
3567-
if (isnull)
3568-
{
3569-
ReleaseSysCache(tuple);
3570-
returnNIL;
3571-
}
3572-
3573-
predString=TextDatumGetCString(predDatum);
3574-
result= (List*)stringToNode(predString);
3575-
pfree(predString);
3576-
ReleaseSysCache(tuple);
3577-
3578-
returnresult;
3579-
}
3580-
35813513
/*
35823514
* get_index_isreplident
35833515
*

‎src/include/utils/lsyscache.h‎

Lines changed: 0 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -195,8 +195,6 @@ extern Oidget_range_collation(Oid rangeOid);
195195
externOidget_range_multirange(OidrangeOid);
196196
externOidget_multirange_range(OidmultirangeOid);
197197
externOidget_index_column_opclass(Oidindex_oid,intattno);
198-
externList*get_index_expressions(Oidindex_oid);
199-
externList*get_index_predicate(Oidindex_oid);
200198
externboolget_index_isreplident(Oidindex_oid);
201199
externboolget_index_isvalid(Oidindex_oid);
202200
externboolget_index_isclustered(Oidindex_oid);

‎src/test/regress/expected/btree_index.out‎

Lines changed: 0 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -387,22 +387,3 @@ ALTER INDEX btree_part_idx ALTER COLUMN id SET (n_distinct=100);
387387
ERROR: ALTER action ALTER COLUMN ... SET cannot be performed on relation "btree_part_idx"
388388
DETAIL: This operation is not supported for partitioned indexes.
389389
DROP TABLE btree_part;
390-
-- Test with index expression and predicate that include a parallel unsafe
391-
-- function.
392-
CREATE FUNCTION para_unsafe_f() RETURNS int IMMUTABLE PARALLEL UNSAFE
393-
AS $$
394-
BEGIN
395-
RETURN 0;
396-
EXCEPTION WHEN OTHERS THEN
397-
RETURN 1;
398-
END$$ LANGUAGE plpgsql;
399-
CREATE TABLE btree_para_bld(i int);
400-
ALTER TABLE btree_para_bld SET (parallel_workers = 4);
401-
SET max_parallel_maintenance_workers TO 4;
402-
-- With parallel-unsafe expression
403-
CREATE INDEX ON btree_para_bld((i + para_unsafe_f()));
404-
-- With parallel-unsafe predicate
405-
CREATE INDEX ON btree_para_bld(i) WHERE i > para_unsafe_f();
406-
RESET max_parallel_maintenance_workers;
407-
DROP TABLE btree_para_bld;
408-
DROP FUNCTION para_unsafe_f;

‎src/test/regress/sql/btree_index.sql‎

Lines changed: 0 additions & 22 deletions
Original file line numberDiff line numberDiff line change
@@ -242,25 +242,3 @@ CREATE TABLE btree_part (id int4) PARTITION BY RANGE (id);
242242
CREATEINDEXbtree_part_idxON btree_part(id);
243243
ALTERINDEX btree_part_idx ALTER COLUMN idSET (n_distinct=100);
244244
DROPTABLE btree_part;
245-
246-
-- Test with index expression and predicate that include a parallel unsafe
247-
-- function.
248-
CREATEFUNCTIONpara_unsafe_f() RETURNSint IMMUTABLE PARALLEL UNSAFE
249-
AS $$
250-
BEGIN
251-
RETURN0;
252-
EXCEPTION WHEN OTHERS THEN
253-
RETURN1;
254-
END$$ LANGUAGE plpgsql;
255-
256-
CREATETABLEbtree_para_bld(iint);
257-
ALTERTABLE btree_para_bldSET (parallel_workers=4);
258-
SET max_parallel_maintenance_workers TO4;
259-
-- With parallel-unsafe expression
260-
CREATEINDEXON btree_para_bld((i+ para_unsafe_f()));
261-
-- With parallel-unsafe predicate
262-
CREATEINDEXON btree_para_bld(i)WHERE i> para_unsafe_f();
263-
264-
RESET max_parallel_maintenance_workers;
265-
DROPTABLE btree_para_bld;
266-
DROPFUNCTION para_unsafe_f;

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