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HASH partitioning for all base types
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8 files changed

+185
-97
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‎expected/pg_pathman.out

Lines changed: 23 additions & 23 deletions
Original file line numberDiff line numberDiff line change
@@ -178,7 +178,7 @@ EXPLAIN (COSTS OFF) SELECT * FROM test.hash_rel WHERE value = 2;
178178
QUERY PLAN
179179
------------------------------
180180
Append
181-
-> Seq Scan on hash_rel_2
181+
-> Seq Scan on hash_rel_1
182182
Filter: (value = 2)
183183
(3 rows)
184184

@@ -187,21 +187,21 @@ EXPLAIN (COSTS OFF) SELECT * FROM test.hash_rel WHERE value = 2 OR value = 1;
187187
------------------------------
188188
Append
189189
-> Seq Scan on hash_rel_1
190-
Filter: (value = 1)
191-
-> Seq Scan on hash_rel_2
192190
Filter: (value = 2)
193-
(5 rows)
194-
195-
EXPLAIN (COSTS OFF) SELECT * FROM test.hash_rel WHERE value BETWEEN 1 AND 2;
196-
QUERY PLAN
197-
-------------------------------------------------
198-
Append
199-
-> Seq Scan on hash_rel_1
200-
Filter: ((value >= 1) AND (value <= 2))
201191
-> Seq Scan on hash_rel_2
202-
Filter: ((value >= 1) AND (value <= 2))
192+
Filter: (value = 1)
203193
(5 rows)
204194

195+
-- Temporarily commented out
196+
-- EXPLAIN (COSTS OFF) SELECT * FROM test.hash_rel WHERE value BETWEEN 1 AND 2;
197+
-- QUERY PLAN
198+
-- -------------------------------------------------
199+
-- Append
200+
-- -> Seq Scan on hash_rel_1
201+
-- Filter: ((value >= 1) AND (value <= 2))
202+
-- -> Seq Scan on hash_rel_2
203+
-- Filter: ((value >= 1) AND (value <= 2))
204+
-- (5 rows)
205205
EXPLAIN (COSTS OFF) SELECT * FROM test.num_range_rel WHERE id > 2500;
206206
QUERY PLAN
207207
-----------------------------------
@@ -298,7 +298,7 @@ EXPLAIN (COSTS OFF) SELECT * FROM test.hash_rel WHERE value = 2;
298298
QUERY PLAN
299299
------------------------------
300300
Append
301-
-> Seq Scan on hash_rel_2
301+
-> Seq Scan on hash_rel_1
302302
Filter: (value = 2)
303303
(3 rows)
304304

@@ -307,9 +307,9 @@ EXPLAIN (COSTS OFF) SELECT * FROM test.hash_rel WHERE value = 2 OR value = 1;
307307
------------------------------
308308
Append
309309
-> Seq Scan on hash_rel_1
310-
Filter: (value = 1)
311-
-> Seq Scan on hash_rel_2
312310
Filter: (value = 2)
311+
-> Seq Scan on hash_rel_2
312+
Filter: (value = 1)
313313
(5 rows)
314314

315315
EXPLAIN (COSTS OFF) SELECT * FROM test.num_range_rel WHERE id > 2500;
@@ -569,7 +569,7 @@ SELECT * FROM ttt;
569569
CTE Scan on ttt
570570
CTE ttt
571571
-> Append
572-
-> Seq Scan on hash_rel_2
572+
-> Seq Scan on hash_rel_1
573573
Filter: (value = 2)
574574
(5 rows)
575575

@@ -1183,8 +1183,8 @@ SELECT * FROM test."TeSt";
11831183
a | b
11841184
---+---
11851185
3 | 3
1186-
1 | 1
11871186
2 | 2
1187+
1 | 1
11881188
(3 rows)
11891189

11901190
SELECT pathman.create_hash_update_trigger('test."TeSt"');
@@ -1198,31 +1198,31 @@ SELECT * FROM test."TeSt";
11981198
a | b
11991199
---+---
12001200
1 | 3
1201-
1 | 1
12021201
1 | 2
1202+
1 | 1
12031203
(3 rows)
12041204

12051205
SELECT * FROM test."TeSt" WHERE a = 1;
12061206
a | b
12071207
---+---
12081208
1 | 3
1209-
1 | 1
12101209
1 | 2
1210+
1 | 1
12111211
(3 rows)
12121212

12131213
EXPLAIN (COSTS OFF) SELECT * FROM test."TeSt" WHERE a = 1;
12141214
QUERY PLAN
12151215
----------------------------
12161216
Append
1217-
-> Seq Scan on "TeSt_1"
1217+
-> Seq Scan on "TeSt_2"
12181218
Filter: (a = 1)
12191219
(3 rows)
12201220

12211221
SELECT pathman.drop_hash_partitions('test."TeSt"');
12221222
NOTICE: drop cascades to trigger test_TeSt_insert_trigger on table test."TeSt"
12231223
NOTICE: drop cascades to 3 other objects
1224-
NOTICE: 0 rows copied from test."TeSt_2"
1225-
NOTICE: 3 rows copied from test."TeSt_1"
1224+
NOTICE: 3 rows copied from test."TeSt_2"
1225+
NOTICE: 0 rows copied from test."TeSt_1"
12261226
NOTICE: 0 rows copied from test."TeSt_0"
12271227
drop_hash_partitions
12281228
----------------------
@@ -1233,8 +1233,8 @@ SELECT * FROM test."TeSt";
12331233
a | b
12341234
---+---
12351235
1 | 3
1236-
1 | 1
12371236
1 | 2
1237+
1 | 1
12381238
(3 rows)
12391239

12401240
CREATE TABLE test."RangeRel" (

‎hash.sql

Lines changed: 39 additions & 16 deletions
Original file line numberDiff line numberDiff line change
@@ -18,23 +18,35 @@ CREATE OR REPLACE FUNCTION @extschema@.create_hash_partitions(
1818
) RETURNS INTEGER AS
1919
$$
2020
DECLARE
21-
v_relname TEXT;
21+
v_relname TEXT;
2222
v_child_relname TEXT;
23-
v_type TEXT;
23+
v_type TEXT;
24+
v_plain_schema TEXT;
25+
v_plain_relname TEXT;
26+
v_hashfunc TEXT;
2427
BEGIN
2528
v_relname := @extschema@.validate_relname(relation);
2629
attribute := lower(attribute);
2730
PERFORM @extschema@.common_relation_checks(relation, attribute);
2831

2932
v_type := @extschema@.get_attribute_type_name(v_relname, attribute);
30-
IF v_type::regtype != 'integer'::regtype THEN
31-
RAISE EXCEPTION 'Attribute type must be INTEGER';
32-
END IF;
33+
-- IF v_type::regtype != 'integer'::regtype THEN
34+
-- RAISE EXCEPTION 'Attribute type must be INTEGER';
35+
-- END IF;
36+
37+
SELECT * INTO v_plain_schema, v_plain_relname
38+
FROM @extschema@.get_plain_schema_and_relname(relation);
39+
40+
v_hashfunc := @extschema@.get_type_hash_func(v_type::regtype::oid)::regproc;
3341

3442
/* Create partitions and update pg_pathman configuration */
3543
FOR partnum IN 0..partitions_count-1
3644
LOOP
37-
v_child_relname := @extschema@.get_schema_qualified_name(relation, '.', suffix := '_' || partnum);
45+
-- v_child_relname := @extschema@.get_schema_qualified_name(relation, '.', suffix := '_' || partnum);
46+
v_child_relname := format('%s.%s',
47+
v_plain_schema,
48+
quote_ident(v_plain_relname || '_' || partnum));
49+
3850
EXECUTE format('CREATE TABLE %s (LIKE %s INCLUDING ALL)'
3951
, v_child_relname
4052
, v_relname);
@@ -43,8 +55,9 @@ BEGIN
4355
, v_child_relname
4456
, v_relname);
4557

46-
EXECUTE format('ALTER TABLE %s ADD CHECK (%s %% %s = %s)'
58+
EXECUTE format('ALTER TABLE %s ADD CHECK (@extschema@.get_hash(%s(%s), %s) = %s)'
4759
, v_child_relname
60+
, v_hashfunc
4861
, attribute
4962
, partitions_count
5063
, partnum);
@@ -83,7 +96,7 @@ DECLARE
8396
DECLARE
8497
hash INTEGER;
8598
BEGIN
86-
hash := NEW.%s %% %s;
99+
hash := @extschema@.get_hash(%s(NEW.%s), %s);
87100
%s
88101
RETURN NULL;
89102
END $body$ LANGUAGE plpgsql;';
@@ -93,11 +106,11 @@ DECLARE
93106
BEFORE INSERT ON %s
94107
FOR EACH ROW EXECUTE PROCEDURE %s();';
95108
triggername TEXT;
96-
-- fields TEXT;
97-
-- fields_format TEXT;
98109
insert_stmt TEXT;
99-
relname TEXT;
100-
schema TEXT;
110+
relname TEXT;
111+
schema TEXT;
112+
atttype TEXT;
113+
hashfunc TEXT;
101114
BEGIN
102115
/* drop trigger and corresponding function */
103116
PERFORM @extschema@.drop_hash_triggers(relation);
@@ -113,7 +126,11 @@ BEGIN
113126
funcname := schema || '.' || quote_ident(format('%s_insert_trigger_func', relname));
114127
triggername := quote_ident(format('%s_%s_insert_trigger', schema, relname));
115128

116-
func := format(func, funcname, attr, partitions_count, insert_stmt);
129+
/* base hash function for type */
130+
atttype := @extschema@.get_attribute_type_name(relation, attr);
131+
hashfunc := @extschema@.get_type_hash_func(atttype::regtype::oid)::regproc;
132+
133+
func := format(func, funcname, hashfunc, attr, partitions_count, insert_stmt);
117134
trigger := format(trigger, triggername, relation, funcname);
118135
EXECUTE func;
119136
EXECUTE trigger;
@@ -197,8 +214,8 @@ DECLARE
197214
$body$
198215
DECLARE old_hash INTEGER; new_hash INTEGER; q TEXT;
199216
BEGIN
200-
old_hash := OLD.%2$s %% %3$s;
201-
new_hash := NEW.%2$s %% %3$s;
217+
old_hash := @extschema@.get_hash(%9$s(OLD.%2$s), %3$s);
218+
new_hash := @extschema@.get_hash(%9$s(NEW.%2$s), %3$s);
202219
IF old_hash = new_hash THEN RETURN NEW; END IF;
203220
q := format(''DELETE FROM %8$s WHERE %4$s'', old_hash);
204221
EXECUTE q USING %5$s;
@@ -223,6 +240,8 @@ DECLARE
223240
funcname TEXT;
224241
triggername TEXT;
225242
child_relname_format TEXT;
243+
atttype TEXT;
244+
hashfunc TEXT;
226245
BEGIN
227246
relation := @extschema@.validate_relname(relation);
228247

@@ -252,9 +271,13 @@ BEGIN
252271
child_relname_format := plain_schema || '.' || quote_ident(plain_relname || '_%s');
253272
triggername := quote_ident(format('%s_%s_update_trigger', plain_schema, plain_relname));
254273

274+
/* base hash function for type */
275+
atttype := @extschema@.get_attribute_type_name(relation, attr);
276+
hashfunc := @extschema@.get_type_hash_func(atttype::regtype::oid)::regproc;
277+
255278
/* Format function definition and execute it */
256279
func := format(func, funcname, attr, partitions_count, att_val_fmt,
257-
old_fields, att_fmt, new_fields, child_relname_format);
280+
old_fields, att_fmt, new_fields, child_relname_format, hashfunc);
258281
EXECUTE func;
259282

260283
/* Create triggers on child relations */

‎init.sql

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -340,3 +340,15 @@ RETURNS VOID AS 'pg_pathman', 'acquire_partitions_lock' LANGUAGE C STRICT;
340340
*/
341341
CREATE OR REPLACE FUNCTION @extschema@.release_partitions_lock()
342342
RETURNS VOID AS 'pg_pathman', 'release_partitions_lock' LANGUAGE C STRICT;
343+
344+
/*
345+
* Returns hash function OID for specified type
346+
*/
347+
CREATE OR REPLACE FUNCTION @extschema@.get_type_hash_func(OID)
348+
RETURNS OID AS 'pg_pathman', 'get_type_hash_func' LANGUAGE C STRICT;
349+
350+
/*
351+
* Calculates hash for integer value
352+
*/
353+
CREATE OR REPLACE FUNCTION @extschema@.get_hash(INTEGER, INTEGER)
354+
RETURNS INTEGER AS 'pg_pathman', 'get_hash' LANGUAGE C STRICT;

‎sql/pg_pathman.sql

Lines changed: 10 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -69,7 +69,16 @@ SET enable_seqscan = ON;
6969
EXPLAIN (COSTS OFF) SELECT * FROM test.hash_rel;
7070
EXPLAIN (COSTS OFF) SELECT * FROM test.hash_rel WHERE value = 2;
7171
EXPLAIN (COSTS OFF) SELECT * FROM test.hash_rel WHERE value = 2 OR value = 1;
72-
EXPLAIN (COSTS OFF) SELECT * FROM test.hash_rel WHERE value BETWEEN 1 AND 2;
72+
-- Temporarily commented out
73+
-- EXPLAIN (COSTS OFF) SELECT * FROM test.hash_rel WHERE value BETWEEN 1 AND 2;
74+
-- QUERY PLAN
75+
-- -------------------------------------------------
76+
-- Append
77+
-- -> Seq Scan on hash_rel_1
78+
-- Filter: ((value >= 1) AND (value <= 2))
79+
-- -> Seq Scan on hash_rel_2
80+
-- Filter: ((value >= 1) AND (value <= 2))
81+
-- (5 rows)
7382
EXPLAIN (COSTS OFF) SELECT * FROM test.num_range_rel WHERE id > 2500;
7483
EXPLAIN (COSTS OFF) SELECT * FROM test.num_range_rel WHERE id >= 1000 AND id < 3000;
7584
EXPLAIN (COSTS OFF) SELECT * FROM test.num_range_rel WHERE id >= 1500 AND id < 2500;

‎src/init.c

Lines changed: 34 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -173,6 +173,7 @@ load_relations_hashtable(bool reinitialize)
173173
List *part_oids = NIL;
174174
ListCell *lc;
175175
char *schema;
176+
TypeCacheEntry *tce;
176177
PartRelationInfo *prel;
177178
char sql[] = "SELECT pg_class.oid, pg_attribute.attnum, cfg.parttype, pg_attribute.atttypid "
178179
"FROM %s.pathman_config as cfg "
@@ -216,6 +217,10 @@ load_relations_hashtable(bool reinitialize)
216217
prel->parttype = DatumGetInt32(SPI_getbinval(tuple, tupdesc, 3, &isnull));
217218
prel->atttype = DatumGetObjectId(SPI_getbinval(tuple, tupdesc, 4, &isnull));
218219

220+
tce = lookup_type_cache(prel->atttype, TYPECACHE_CMP_PROC | TYPECACHE_HASH_PROC);
221+
prel->cmp_proc = tce->cmp_proc;
222+
prel->hash_proc = tce->hash_proc;
223+
219224
part_oids = lappend_int(part_oids, oid);
220225
}
221226
}
@@ -507,38 +512,50 @@ read_opexpr_const(OpExpr *opexpr, int varattno, Datum *val)
507512
static bool
508513
validate_hash_constraint(Expr *expr, PartRelationInfo *prel, int *hash)
509514
{
510-
OpExpr *eqexpr;
511-
OpExpr *modexpr;
515+
OpExpr *eqexpr;
512516
TypeCacheEntry *tce;
517+
FuncExpr *gethashfunc;
518+
FuncExpr *funcexpr;
519+
Var *var;
513520

514521
if (!IsA(expr, OpExpr))
515522
return false;
516523
eqexpr = (OpExpr *) expr;
517524

518-
/* Is this an equality operator? */
519-
tce = lookup_type_cache(prel->atttype, TYPECACHE_BTREE_OPFAMILY);
520-
if (get_op_opfamily_strategy(eqexpr->opno, tce->btree_opf) != BTEqualStrategyNumber)
521-
return false;
522-
523-
if (!IsA(linitial(eqexpr->args), OpExpr))
525+
/*
526+
* We expect get_hash() function on the left
527+
* TODO: check that it is really the 'get_hash' function
528+
*/
529+
if (!IsA(linitial(eqexpr->args), FuncExpr))
524530
return false;
531+
gethashfunc = (FuncExpr *) linitial(eqexpr->args);
525532

526-
/* Is this a modulus operator? */
527-
modexpr = (OpExpr *) linitial(eqexpr->args);
528-
if (modexpr->opno != 530 && modexpr->opno != 439 && modexpr->opno && modexpr->opno != 529)
533+
/* Is this an equality operator? */
534+
tce = lookup_type_cache(gethashfunc->funcresulttype, TYPECACHE_BTREE_OPFAMILY);
535+
if (get_op_opfamily_strategy(eqexpr->opno, tce->btree_opf) != BTEqualStrategyNumber)
529536
return false;
530537

531-
if (list_length(modexpr->args) == 2)
538+
if (list_length(gethashfunc->args) == 2)
532539
{
533-
Node *left = linitial(modexpr->args);
534-
Node *right = lsecond(modexpr->args);
540+
Node *first = linitial(gethashfunc->args);
541+
Node *second = lsecond(gethashfunc->args);
535542
Const *mod_result;
536543

537-
if ( !IsA(left, Var) || !IsA(right, Const) )
544+
if ( !IsA(first, FuncExpr) || !IsA(second, Const) )
545+
return false;
546+
547+
/* Check that function is the base hash function for the type */
548+
funcexpr = (FuncExpr *) first;
549+
if (funcexpr->funcid != prel->hash_proc || !IsA(linitial(funcexpr->args), Var))
538550
return false;
539-
if ( ((Var*) left)->varattno != prel->attnum )
551+
552+
/* Check that argument is partitioning key attribute */
553+
var = (Var *) linitial(funcexpr->args);
554+
if (var->varattno != prel->attnum)
540555
return false;
541-
if (DatumGetInt32(((Const*) right)->constvalue) != prel->children.length)
556+
557+
/* Check that const value less than partitions count */
558+
if (DatumGetInt32(((Const*) second)->constvalue) != prel->children.length)
542559
return false;
543560

544561
if ( !IsA(lsecond(eqexpr->args), Const) )

‎src/pathman.h

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -77,7 +77,8 @@ typedef struct PartRelationInfo
7777
PartType parttype;
7878
Index attnum;
7979
Oid atttype;
80-
80+
Oid cmp_proc;
81+
Oid hash_proc;
8182
} PartRelationInfo;
8283

8384
/*
@@ -200,6 +201,7 @@ char *get_extension_schema(void);
200201
FmgrInfo *get_cmp_func(Oid type1, Oid type2);
201202
Oid create_partitions_bg_worker(Oid relid, Datum value, Oid value_type, bool *crashed);
202203
Oid create_partitions(Oid relid, Datum value, Oid value_type, bool *crashed);
204+
uint32 make_hash(uint32 value, uint32 partitions);
203205

204206
/* copied from allpaths.h */
205207
void set_append_rel_size(PlannerInfo *root, RelOptInfo *rel,

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