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Commit874fe3a

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Fix CREATE MATVIEW/CREATE TABLE AS ... WITH NO DATA to not plan the query.
Previously, these commands always planned the given query and went throughexecutor startup before deciding not to actually run the query if WITH NODATA is specified. This behavior is problematic for pg_dump because itmay cause errors to be raised that we would rather not see before aREFRESH MATERIALIZED VIEW command is issued. See for example bug #13907from Marian Krucina. This change is not sufficient to fix that particularbug, because we also need to tweak pg_dump to issue the REFRESH later,but it's a necessary step on the way.A user-visible side effect of doing things this way is that the returnedcommand tag for WITH NO DATA cases will now be "CREATE MATERIALIZED VIEW"or "CREATE TABLE AS", not "SELECT 0". We could preserve the old behaviorbut it would take more code, and arguably that was just an implementationartifact not intended behavior anyhow.In 9.5 and HEAD, also get rid of the static variable CreateAsReladdr, whichwas trouble waiting to happen; there is not any prohibition on nestedCREATE commands.Back-patch to 9.3 where CREATE MATERIALIZED VIEW was introduced.Michael Paquier and Tom LaneReport: <20160202161407.2778.24659@wrigleys.postgresql.org>
1 parent6734a1c commit874fe3a

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8 files changed

+391
-161
lines changed

8 files changed

+391
-161
lines changed

‎src/backend/commands/createas.c

Lines changed: 237 additions & 141 deletions
Large diffs are not rendered by default.

‎src/backend/commands/view.c

Lines changed: 5 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -82,25 +82,14 @@ DefineVirtualRelation(RangeVar *relation, List *tlist, bool replace,
8282
attrList=NIL;
8383
foreach(t,tlist)
8484
{
85-
TargetEntry*tle=lfirst(t);
85+
TargetEntry*tle=(TargetEntry*)lfirst(t);
8686

8787
if (!tle->resjunk)
8888
{
89-
ColumnDef*def=makeNode(ColumnDef);
90-
91-
def->colname=pstrdup(tle->resname);
92-
def->typeName=makeTypeNameFromOid(exprType((Node*)tle->expr),
93-
exprTypmod((Node*)tle->expr));
94-
def->inhcount=0;
95-
def->is_local= true;
96-
def->is_not_null= false;
97-
def->is_from_type= false;
98-
def->storage=0;
99-
def->raw_default=NULL;
100-
def->cooked_default=NULL;
101-
def->collClause=NULL;
102-
def->collOid=exprCollation((Node*)tle->expr);
103-
def->location=-1;
89+
ColumnDef*def=makeColumnDef(tle->resname,
90+
exprType((Node*)tle->expr),
91+
exprTypmod((Node*)tle->expr),
92+
exprCollation((Node*)tle->expr));
10493

10594
/*
10695
* It's possible that the column is of a collatable type but the
@@ -117,7 +106,6 @@ DefineVirtualRelation(RangeVar *relation, List *tlist, bool replace,
117106
}
118107
else
119108
Assert(!OidIsValid(def->collOid));
120-
def->constraints=NIL;
121109

122110
attrList=lappend(attrList,def);
123111
}

‎src/backend/nodes/makefuncs.c

Lines changed: 30 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -476,6 +476,36 @@ makeTypeNameFromOid(Oid typeOid, int32 typmod)
476476
returnn;
477477
}
478478

479+
/*
480+
* makeColumnDef -
481+
*build a ColumnDef node to represent a simple column definition.
482+
*
483+
* Type and collation are specified by OID.
484+
* Other properties are all basic to start with.
485+
*/
486+
ColumnDef*
487+
makeColumnDef(constchar*colname,OidtypeOid,int32typmod,OidcollOid)
488+
{
489+
ColumnDef*n=makeNode(ColumnDef);
490+
491+
n->colname=pstrdup(colname);
492+
n->typeName=makeTypeNameFromOid(typeOid,typmod);
493+
n->inhcount=0;
494+
n->is_local= true;
495+
n->is_not_null= false;
496+
n->is_from_type= false;
497+
n->storage=0;
498+
n->raw_default=NULL;
499+
n->cooked_default=NULL;
500+
n->collClause=NULL;
501+
n->collOid=collOid;
502+
n->constraints=NIL;
503+
n->fdwoptions=NIL;
504+
n->location=-1;
505+
506+
returnn;
507+
}
508+
479509
/*
480510
* makeFuncExpr -
481511
*build an expression tree representing a function call.

‎src/include/nodes/makefuncs.h

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -72,6 +72,9 @@ extern TypeName *makeTypeName(char *typnam);
7272
externTypeName*makeTypeNameFromNameList(List*names);
7373
externTypeName*makeTypeNameFromOid(OidtypeOid,int32typmod);
7474

75+
externColumnDef*makeColumnDef(constchar*colname,
76+
OidtypeOid,int32typmod,OidcollOid);
77+
7578
externFuncExpr*makeFuncExpr(Oidfuncid,Oidrettype,List*args,
7679
Oidfunccollid,Oidinputcollid,CoercionFormfformat);
7780

‎src/test/regress/expected/matview.out

Lines changed: 41 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -455,13 +455,23 @@ DROP TABLE mvtest_boxes CASCADE;
455455
NOTICE: drop cascades to materialized view mvtest_boxmv
456456
-- make sure that column names are handled correctly
457457
CREATE TABLE mvtest_v (i int, j int);
458-
CREATE MATERIALIZED VIEW mvtest_mv_v (ii) AS SELECT i, j AS jj FROM mvtest_v;
458+
CREATE MATERIALIZED VIEW mvtest_mv_v (ii, jj, kk) AS SELECT i, j FROM mvtest_v; -- error
459+
ERROR: too many column names were specified
460+
CREATE MATERIALIZED VIEW mvtest_mv_v (ii, jj) AS SELECT i, j FROM mvtest_v; -- ok
461+
CREATE MATERIALIZED VIEW mvtest_mv_v_2 (ii) AS SELECT i, j FROM mvtest_v; -- ok
462+
CREATE MATERIALIZED VIEW mvtest_mv_v_3 (ii, jj, kk) AS SELECT i, j FROM mvtest_v WITH NO DATA; -- error
463+
ERROR: too many column names were specified
464+
CREATE MATERIALIZED VIEW mvtest_mv_v_3 (ii, jj) AS SELECT i, j FROM mvtest_v WITH NO DATA; -- ok
465+
CREATE MATERIALIZED VIEW mvtest_mv_v_4 (ii) AS SELECT i, j FROM mvtest_v WITH NO DATA; -- ok
459466
ALTER TABLE mvtest_v RENAME COLUMN i TO x;
460467
INSERT INTO mvtest_v values (1, 2);
461468
CREATE UNIQUE INDEX mvtest_mv_v_ii ON mvtest_mv_v (ii);
462469
REFRESH MATERIALIZED VIEW mvtest_mv_v;
463470
UPDATE mvtest_v SET j = 3 WHERE x = 1;
464471
REFRESH MATERIALIZED VIEW CONCURRENTLY mvtest_mv_v;
472+
REFRESH MATERIALIZED VIEW mvtest_mv_v_2;
473+
REFRESH MATERIALIZED VIEW mvtest_mv_v_3;
474+
REFRESH MATERIALIZED VIEW mvtest_mv_v_4;
465475
SELECT * FROM mvtest_v;
466476
x | j
467477
---+---
@@ -474,8 +484,37 @@ SELECT * FROM mvtest_mv_v;
474484
1 | 3
475485
(1 row)
476486

487+
SELECT * FROM mvtest_mv_v_2;
488+
ii | j
489+
----+---
490+
1 | 3
491+
(1 row)
492+
493+
SELECT * FROM mvtest_mv_v_3;
494+
ii | jj
495+
----+----
496+
1 | 3
497+
(1 row)
498+
499+
SELECT * FROM mvtest_mv_v_4;
500+
ii | j
501+
----+---
502+
1 | 3
503+
(1 row)
504+
477505
DROP TABLE mvtest_v CASCADE;
478-
NOTICE: drop cascades to materialized view mvtest_mv_v
506+
NOTICE: drop cascades to 4 other objects
507+
DETAIL: drop cascades to materialized view mvtest_mv_v
508+
drop cascades to materialized view mvtest_mv_v_2
509+
drop cascades to materialized view mvtest_mv_v_3
510+
drop cascades to materialized view mvtest_mv_v_4
511+
-- make sure that create WITH NO DATA does not plan the query (bug #13907)
512+
create materialized view mvtest_error as select 1/0 as x; -- fail
513+
ERROR: division by zero
514+
create materialized view mvtest_error as select 1/0 as x with no data;
515+
refresh materialized view mvtest_error; -- fail here
516+
ERROR: division by zero
517+
drop materialized view mvtest_error;
479518
-- make sure that matview rows can be referenced as source rows (bug #9398)
480519
CREATE TABLE mvtest_v AS SELECT generate_series(1,10) AS a;
481520
CREATE MATERIALIZED VIEW mvtest_mv_v AS SELECT a FROM mvtest_v WHERE a <= 5;

‎src/test/regress/expected/select_into.out

Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -50,6 +50,44 @@ DETAIL: drop cascades to table selinto_schema.tmp1
5050
drop cascades to table selinto_schema.tmp2
5151
drop cascades to table selinto_schema.tmp3
5252
DROP USER selinto_user;
53+
-- Tests for WITH NO DATA and column name consistency
54+
CREATE TABLE ctas_base (i int, j int);
55+
INSERT INTO ctas_base VALUES (1, 2);
56+
CREATE TABLE ctas_nodata (ii, jj, kk) AS SELECT i, j FROM ctas_base; -- Error
57+
ERROR: too many column names were specified
58+
CREATE TABLE ctas_nodata (ii, jj, kk) AS SELECT i, j FROM ctas_base WITH NO DATA; -- Error
59+
ERROR: too many column names were specified
60+
CREATE TABLE ctas_nodata (ii, jj) AS SELECT i, j FROM ctas_base; -- OK
61+
CREATE TABLE ctas_nodata_2 (ii, jj) AS SELECT i, j FROM ctas_base WITH NO DATA; -- OK
62+
CREATE TABLE ctas_nodata_3 (ii) AS SELECT i, j FROM ctas_base; -- OK
63+
CREATE TABLE ctas_nodata_4 (ii) AS SELECT i, j FROM ctas_base WITH NO DATA; -- OK
64+
SELECT * FROM ctas_nodata;
65+
ii | jj
66+
----+----
67+
1 | 2
68+
(1 row)
69+
70+
SELECT * FROM ctas_nodata_2;
71+
ii | jj
72+
----+----
73+
(0 rows)
74+
75+
SELECT * FROM ctas_nodata_3;
76+
ii | j
77+
----+---
78+
1 | 2
79+
(1 row)
80+
81+
SELECT * FROM ctas_nodata_4;
82+
ii | j
83+
----+---
84+
(0 rows)
85+
86+
DROP TABLE ctas_base;
87+
DROP TABLE ctas_nodata;
88+
DROP TABLE ctas_nodata_2;
89+
DROP TABLE ctas_nodata_3;
90+
DROP TABLE ctas_nodata_4;
5391
--
5492
-- CREATE TABLE AS/SELECT INTO as last command in a SQL function
5593
-- have been known to cause problems

‎src/test/regress/sql/matview.sql

Lines changed: 18 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -176,17 +176,34 @@ DROP TABLE mvtest_boxes CASCADE;
176176

177177
-- make sure that column names are handled correctly
178178
CREATETABLEmvtest_v (iint, jint);
179-
CREATE MATERIALIZED VIEW mvtest_mv_v (ii)ASSELECT i, jAS jjFROM mvtest_v;
179+
CREATE MATERIALIZED VIEW mvtest_mv_v (ii, jj, kk)ASSELECT i, jFROM mvtest_v;-- error
180+
CREATE MATERIALIZED VIEW mvtest_mv_v (ii, jj)ASSELECT i, jFROM mvtest_v;-- ok
181+
CREATE MATERIALIZED VIEW mvtest_mv_v_2 (ii)ASSELECT i, jFROM mvtest_v;-- ok
182+
CREATE MATERIALIZED VIEW mvtest_mv_v_3 (ii, jj, kk)ASSELECT i, jFROM mvtest_v WITH NO DATA;-- error
183+
CREATE MATERIALIZED VIEW mvtest_mv_v_3 (ii, jj)ASSELECT i, jFROM mvtest_v WITH NO DATA;-- ok
184+
CREATE MATERIALIZED VIEW mvtest_mv_v_4 (ii)ASSELECT i, jFROM mvtest_v WITH NO DATA;-- ok
180185
ALTERTABLE mvtest_v RENAME COLUMN i TO x;
181186
INSERT INTO mvtest_vvalues (1,2);
182187
CREATEUNIQUE INDEXmvtest_mv_v_iiON mvtest_mv_v (ii);
183188
REFRESH MATERIALIZED VIEW mvtest_mv_v;
184189
UPDATE mvtest_vSET j=3WHERE x=1;
185190
REFRESH MATERIALIZED VIEW CONCURRENTLY mvtest_mv_v;
191+
REFRESH MATERIALIZED VIEW mvtest_mv_v_2;
192+
REFRESH MATERIALIZED VIEW mvtest_mv_v_3;
193+
REFRESH MATERIALIZED VIEW mvtest_mv_v_4;
186194
SELECT*FROM mvtest_v;
187195
SELECT*FROM mvtest_mv_v;
196+
SELECT*FROM mvtest_mv_v_2;
197+
SELECT*FROM mvtest_mv_v_3;
198+
SELECT*FROM mvtest_mv_v_4;
188199
DROPTABLE mvtest_v CASCADE;
189200

201+
-- make sure that create WITH NO DATA does not plan the query (bug #13907)
202+
create materialized view mvtest_errorasselect1/0as x;-- fail
203+
create materialized view mvtest_errorasselect1/0as x with no data;
204+
refresh materialized view mvtest_error;-- fail here
205+
drop materialized view mvtest_error;
206+
190207
-- make sure that matview rows can be referenced as source rows (bug #9398)
191208
CREATETABLEmvtest_vASSELECT generate_series(1,10)AS a;
192209
CREATE MATERIALIZED VIEW mvtest_mv_vASSELECT aFROM mvtest_vWHERE a<=5;

‎src/test/regress/sql/select_into.sql

Lines changed: 19 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -53,6 +53,25 @@ RESET SESSION AUTHORIZATION;
5353
DROPSCHEMA selinto_schema CASCADE;
5454
DROPUSER selinto_user;
5555

56+
-- Tests for WITH NO DATA and column name consistency
57+
CREATETABLEctas_base (iint, jint);
58+
INSERT INTO ctas_baseVALUES (1,2);
59+
CREATETABLEctas_nodata (ii, jj, kk)ASSELECT i, jFROM ctas_base;-- Error
60+
CREATETABLEctas_nodata (ii, jj, kk)ASSELECT i, jFROM ctas_base WITH NO DATA;-- Error
61+
CREATETABLEctas_nodata (ii, jj)ASSELECT i, jFROM ctas_base;-- OK
62+
CREATETABLEctas_nodata_2 (ii, jj)ASSELECT i, jFROM ctas_base WITH NO DATA;-- OK
63+
CREATETABLEctas_nodata_3 (ii)ASSELECT i, jFROM ctas_base;-- OK
64+
CREATETABLEctas_nodata_4 (ii)ASSELECT i, jFROM ctas_base WITH NO DATA;-- OK
65+
SELECT*FROM ctas_nodata;
66+
SELECT*FROM ctas_nodata_2;
67+
SELECT*FROM ctas_nodata_3;
68+
SELECT*FROM ctas_nodata_4;
69+
DROPTABLE ctas_base;
70+
DROPTABLE ctas_nodata;
71+
DROPTABLE ctas_nodata_2;
72+
DROPTABLE ctas_nodata_3;
73+
DROPTABLE ctas_nodata_4;
74+
5675
--
5776
-- CREATE TABLE AS/SELECT INTO as last command in a SQL function
5877
-- have been known to cause problems

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