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Fix ruleutils to cope with conflicts from adding/dropping/renaming columns.

Browse Source 
In commit 11e131854f, we improved the
rule/view dumping code so that it would produce valid query representations
even if some of the tables involved in a query had been renamed since the
query was parsed.  This patch extends that idea to fix problems that occur
when individual columns are renamed, or added or dropped.  As before, the
core of the fix is to assign unique new aliases when a name conflict has
been created.  This is complicated by the JOIN USING feature, which
requires the same column alias to be used in both input relations, but we
can handle that with a sufficiently complex approach to assigning aliases.

A fortiori, this patch takes care of situations where the query didn't have
unique column names to begin with, such as in a recent complaint from Bryan
Nuse.  (Because of expansion of "SELECT *", re-parsing a dumped query can
require column name uniqueness even though the original text did not.)
pull/3/head
Tom Lane 13 years ago
parent 7eb559a86d
commit 2ffa740be9
5 changed files with 1764 additions and 254 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 12
      src/backend/commands/explain.c
  2. 15
      src/backend/commands/typecmds.c
  3. 1576
      src/backend/utils/adt/ruleutils.c
  4. 428
      src/test/regress/expected/create_view.out
  5. 109
      src/test/regress/sql/create_view.sql

12
src/backend/commands/explain.c
Unescape View File

@ -653,9 +653,9 @@ elapsed_time(instr_time *starttime)
* Prescan the planstate tree to identify which RTEs are referenced
*
* Adds the relid of each referenced RTE to *rels_used. The result controls
* which RTEs are assigned aliases by select_rtable_names_for_explain. This
* ensures that we don't confusingly assign un-suffixed aliases to RTEs that
* never appear in the EXPLAIN output (such as inheritance parents).
* which RTEs are assigned aliases by select_rtable_names_for_explain.
* This ensures that we don't confusingly assign un-suffixed aliases to RTEs
* that never appear in the EXPLAIN output (such as inheritance parents).
*/
static void
ExplainPreScanNode(PlanState *planstate, Bitmapset **rels_used)
@ -1954,6 +1954,8 @@ ExplainTargetRel(Plan *plan, Index rti, ExplainState *es)
rte = rt_fetch(rti, es->rtable);
refname = (char *) list_nth(es->rtable_names, rti - 1);
if (refname == NULL)
refname = rte->eref->aliasname;
switch (nodeTag(plan))
{
@ -2026,8 +2028,7 @@ ExplainTargetRel(Plan *plan, Index rti, ExplainState *es)
quote_identifier(objectname));
else if (objectname != NULL)
appendStringInfo(es->str, " %s", quote_identifier(objectname));
if (refname != NULL &&
(objectname == NULL || strcmp(refname, objectname) != 0))
if (objectname == NULL || strcmp(refname, objectname) != 0)
appendStringInfo(es->str, " %s", quote_identifier(refname));
}
else
@ -2036,7 +2037,6 @@ ExplainTargetRel(Plan *plan, Index rti, ExplainState *es)
ExplainPropertyText(objecttag, objectname, es);
if (namespace != NULL)
ExplainPropertyText("Schema", namespace, es);
if (refname != NULL)
ExplainPropertyText("Alias", refname, es);
}
}

15
src/backend/commands/typecmds.c
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@ -888,9 +888,7 @@ DefineDomain(CreateDomainStmt *stmt)
*/
defaultValue =
deparse_expression(defaultExpr,
deparse_context_for(domainName,
InvalidOid),
false, false);
NIL, false, false);
defaultValueBin = nodeToString(defaultExpr);
}
}
@ -2143,9 +2141,7 @@ AlterDomainDefault(List *names, Node *defaultRaw)
* easier for pg_dump).
*/
defaultValue = deparse_expression(defaultExpr,
deparse_context_for(NameStr(typTup->typname),
InvalidOid),
false, false);
NIL, false, false);
/*
* Form an updated tuple with the new default and write it back.
@ -2941,14 +2937,9 @@ domainAddConstraint(Oid domainOid, Oid domainNamespace, Oid baseTypeOid,
/*
* Deparse it to produce text for consrc.
*
* Since VARNOs aren't allowed in domain constraints, relation context
* isn't required as anything other than a shell.
*/
ccsrc = deparse_expression(expr,
deparse_context_for(domainName,
InvalidOid),
false, false);
NIL, false, false);
/*
* Store the constraint in pg_constraint

1576
src/backend/utils/adt/ruleutils.c
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File diff suppressed because it is too large Load Diff

428
src/test/regress/expected/create_view.out
Unescape View File

@ -288,7 +288,7 @@ SELECT relname, relkind, reloptions FROM pg_class
mysecview4 | v | {security_barrier=false}
(4 rows)
-- Test view decompilation in the face of renaming conflicts
-- Test view decompilation in the face of relation renaming conflicts
CREATE TABLE tt1 (f1 int, f2 int, f3 text);
CREATE TABLE tx1 (x1 int, x2 int, x3 text);
CREATE TABLE temp_view_test.tt1 (y1 int, f2 int, f3 text);
@ -648,57 +648,379 @@ View definition:
FROM temp_view_test.tx1 tx1_1
WHERE tx1.y1 = tx1_1.f1));
-- Test view decompilation in the face of column addition/deletion/renaming
create table tt2 (a int, b int, c int);
create table tt3 (ax int8, b int2, c numeric);
create table tt4 (ay int, b int, q int);
create view v1 as select * from tt2 natural join tt3;
create view v1a as select * from (tt2 natural join tt3) j;
create view v2 as select * from tt2 join tt3 using (b,c) join tt4 using (b);
create view v2a as select * from (tt2 join tt3 using (b,c) join tt4 using (b)) j;
create view v3 as select * from tt2 join tt3 using (b,c) full join tt4 using (b);
select pg_get_viewdef('v1', true);
pg_get_viewdef
-------------------------------------
SELECT tt2.b, tt3.c, tt2.a, tt3.ax+
FROM tt2 +
JOIN tt3 USING (b, c);
(1 row)
select pg_get_viewdef('v1a', true);
pg_get_viewdef
------------------------------
SELECT j.b, j.c, j.a, j.ax +
FROM (tt2 +
JOIN tt3 USING (b, c)) j;
(1 row)
select pg_get_viewdef('v2', true);
pg_get_viewdef
----------------------------------------------------
SELECT tt2.b, tt3.c, tt2.a, tt3.ax, tt4.ay, tt4.q+
FROM tt2 +
JOIN tt3 USING (b, c) +
JOIN tt4 USING (b);
(1 row)
select pg_get_viewdef('v2a', true);
pg_get_viewdef
----------------------------------------
SELECT j.b, j.c, j.a, j.ax, j.ay, j.q+
FROM (tt2 +
JOIN tt3 USING (b, c) +
JOIN tt4 USING (b)) j;
(1 row)
select pg_get_viewdef('v3', true);
pg_get_viewdef
------------------------------------------------
SELECT b, tt3.c, tt2.a, tt3.ax, tt4.ay, tt4.q+
FROM tt2 +
JOIN tt3 USING (b, c) +
FULL JOIN tt4 USING (b);
(1 row)
alter table tt2 add column d int;
alter table tt2 add column e int;
select pg_get_viewdef('v1', true);
pg_get_viewdef
-------------------------------------
SELECT tt2.b, tt3.c, tt2.a, tt3.ax+
FROM tt2 +
JOIN tt3 USING (b, c);
(1 row)
select pg_get_viewdef('v1a', true);
pg_get_viewdef
------------------------------
SELECT j.b, j.c, j.a, j.ax +
FROM (tt2 +
JOIN tt3 USING (b, c)) j;
(1 row)
select pg_get_viewdef('v2', true);
pg_get_viewdef
----------------------------------------------------
SELECT tt2.b, tt3.c, tt2.a, tt3.ax, tt4.ay, tt4.q+
FROM tt2 +
JOIN tt3 USING (b, c) +
JOIN tt4 USING (b);
(1 row)
select pg_get_viewdef('v2a', true);
pg_get_viewdef
----------------------------------------
SELECT j.b, j.c, j.a, j.ax, j.ay, j.q+
FROM (tt2 +
JOIN tt3 USING (b, c) +
JOIN tt4 USING (b)) j;
(1 row)
select pg_get_viewdef('v3', true);
pg_get_viewdef
------------------------------------------------
SELECT b, tt3.c, tt2.a, tt3.ax, tt4.ay, tt4.q+
FROM tt2 +
JOIN tt3 USING (b, c) +
FULL JOIN tt4 USING (b);
(1 row)
alter table tt3 rename c to d;
select pg_get_viewdef('v1', true);
pg_get_viewdef
-----------------------------------------
SELECT tt2.b, tt3.c, tt2.a, tt3.ax +
FROM tt2 +
JOIN tt3 tt3(ax, b, c) USING (b, c);
(1 row)
select pg_get_viewdef('v1a', true);
pg_get_viewdef
--------------------------------------------
SELECT j.b, j.c, j.a, j.ax +
FROM (tt2 +
JOIN tt3 tt3(ax, b, c) USING (b, c)) j;
(1 row)
select pg_get_viewdef('v2', true);
pg_get_viewdef
----------------------------------------------------
SELECT tt2.b, tt3.c, tt2.a, tt3.ax, tt4.ay, tt4.q+
FROM tt2 +
JOIN tt3 tt3(ax, b, c) USING (b, c) +
JOIN tt4 USING (b);
(1 row)
select pg_get_viewdef('v2a', true);
pg_get_viewdef
----------------------------------------
SELECT j.b, j.c, j.a, j.ax, j.ay, j.q+
FROM (tt2 +
JOIN tt3 tt3(ax, b, c) USING (b, c)+
JOIN tt4 USING (b)) j;
(1 row)
select pg_get_viewdef('v3', true);
pg_get_viewdef
------------------------------------------------
SELECT b, tt3.c, tt2.a, tt3.ax, tt4.ay, tt4.q+
FROM tt2 +
JOIN tt3 tt3(ax, b, c) USING (b, c) +
FULL JOIN tt4 USING (b);
(1 row)
alter table tt3 add column c int;
alter table tt3 add column e int;
select pg_get_viewdef('v1', true);
pg_get_viewdef
-------------------------------------------------
SELECT tt2.b, tt3.c, tt2.a, tt3.ax +
FROM tt2 +
JOIN tt3 tt3(ax, b, c, c_1, e) USING (b, c);
(1 row)
select pg_get_viewdef('v1a', true);
pg_get_viewdef
---------------------------------------------------------------------------------
SELECT j.b, j.c, j.a, j.ax +
FROM (tt2 +
JOIN tt3 tt3(ax, b, c, c_1, e) USING (b, c)) j(b, c, a, d, e, ax, c_1, e_1);
(1 row)
select pg_get_viewdef('v2', true);
pg_get_viewdef
----------------------------------------------------
SELECT tt2.b, tt3.c, tt2.a, tt3.ax, tt4.ay, tt4.q+
FROM tt2 +
JOIN tt3 tt3(ax, b, c, c_1, e) USING (b, c) +
JOIN tt4 USING (b);
(1 row)
select pg_get_viewdef('v2a', true);
pg_get_viewdef
---------------------------------------------------------------
SELECT j.b, j.c, j.a, j.ax, j.ay, j.q +
FROM (tt2 +
JOIN tt3 tt3(ax, b, c, c_1, e) USING (b, c) +
JOIN tt4 USING (b)) j(b, c, a, d, e, ax, c_1, e_1, ay, q);
(1 row)
select pg_get_viewdef('v3', true);
pg_get_viewdef
------------------------------------------------
SELECT b, tt3.c, tt2.a, tt3.ax, tt4.ay, tt4.q+
FROM tt2 +
JOIN tt3 tt3(ax, b, c, c_1, e) USING (b, c)+
FULL JOIN tt4 USING (b);
(1 row)
alter table tt2 drop column d;
select pg_get_viewdef('v1', true);
pg_get_viewdef
-------------------------------------------------
SELECT tt2.b, tt3.c, tt2.a, tt3.ax +
FROM tt2 +
JOIN tt3 tt3(ax, b, c, c_1, e) USING (b, c);
(1 row)
select pg_get_viewdef('v1a', true);
pg_get_viewdef
------------------------------------------------------------------------------
SELECT j.b, j.c, j.a, j.ax +
FROM (tt2 +
JOIN tt3 tt3(ax, b, c, c_1, e) USING (b, c)) j(b, c, a, e, ax, c_1, e_1);
(1 row)
select pg_get_viewdef('v2', true);
pg_get_viewdef
----------------------------------------------------
SELECT tt2.b, tt3.c, tt2.a, tt3.ax, tt4.ay, tt4.q+
FROM tt2 +
JOIN tt3 tt3(ax, b, c, c_1, e) USING (b, c) +
JOIN tt4 USING (b);
(1 row)
select pg_get_viewdef('v2a', true);
pg_get_viewdef
------------------------------------------------------------
SELECT j.b, j.c, j.a, j.ax, j.ay, j.q +
FROM (tt2 +
JOIN tt3 tt3(ax, b, c, c_1, e) USING (b, c) +
JOIN tt4 USING (b)) j(b, c, a, e, ax, c_1, e_1, ay, q);
(1 row)
select pg_get_viewdef('v3', true);
pg_get_viewdef
------------------------------------------------
SELECT b, tt3.c, tt2.a, tt3.ax, tt4.ay, tt4.q+
FROM tt2 +
JOIN tt3 tt3(ax, b, c, c_1, e) USING (b, c)+
FULL JOIN tt4 USING (b);
(1 row)
create table tt5 (a int, b int);
create table tt6 (c int, d int);
create view vv1 as select * from (tt5 cross join tt6) j(aa,bb,cc,dd);
select pg_get_viewdef('vv1', true);
pg_get_viewdef
--------------------------------------
SELECT j.aa, j.bb, j.cc, j.dd +
FROM (tt5 +
CROSS JOIN tt6) j(aa, bb, cc, dd);
(1 row)
alter table tt5 add column c int;
select pg_get_viewdef('vv1', true);
pg_get_viewdef
-----------------------------------------
SELECT j.aa, j.bb, j.cc, j.dd +
FROM (tt5 +
CROSS JOIN tt6) j(aa, bb, c, cc, dd);
(1 row)
alter table tt5 add column cc int;
select pg_get_viewdef('vv1', true);
pg_get_viewdef
-----------------------------------------------
SELECT j.aa, j.bb, j.cc, j.dd +
FROM (tt5 +
CROSS JOIN tt6) j(aa, bb, c, cc_1, cc, dd);
(1 row)
alter table tt5 drop column c;
select pg_get_viewdef('vv1', true);
pg_get_viewdef
--------------------------------------------
SELECT j.aa, j.bb, j.cc, j.dd +
FROM (tt5 +
CROSS JOIN tt6) j(aa, bb, cc_1, cc, dd);
(1 row)
-- Unnamed FULL JOIN USING is lots of fun too
create table tt7 (x int, xx int, y int);
alter table tt7 drop column xx;
create table tt8 (x int, z int);
create view vv2 as
select * from (values(1,2,3,4,5)) v(a,b,c,d,e)
union all
select * from tt7 full join tt8 using (x), tt8 tt8x;
select pg_get_viewdef('vv2', true);
pg_get_viewdef
----------------------------------------------------------------------------
SELECT v.a, v.b, v.c, v.d, v.e +
FROM ( VALUES (1,2,3,4,5)) v(a, b, c, d, e) +
UNION ALL +
SELECT x AS a, tt7.y AS b, tt8.z AS c, tt8x.x_1 AS d, tt8x.z AS e+
FROM tt7 +
FULL JOIN tt8 USING (x), tt8 tt8x(x_1, z);
(1 row)
create view vv3 as
select * from (values(1,2,3,4,5,6)) v(a,b,c,x,e,f)
union all
select * from
tt7 full join tt8 using (x),
tt7 tt7x full join tt8 tt8x using (x);
select pg_get_viewdef('vv3', true);
pg_get_viewdef
-------------------------------------------------------------------------
SELECT v.a, v.b, v.c, v.x, v.e, v.f +
FROM ( VALUES (1,2,3,4,5,6)) v(a, b, c, x, e, f) +
UNION ALL +
SELECT x AS a, tt7.y AS b, tt8.z AS c, x_1 AS x, tt7x.y AS e, +
tt8x.z AS f +
FROM tt7 +
FULL JOIN tt8 USING (x), +
tt7 tt7x(x_1, y) +
FULL JOIN tt8 tt8x(x_1, z) USING (x_1);
(1 row)
create view vv4 as
select * from (values(1,2,3,4,5,6,7)) v(a,b,c,x,e,f,g)
union all
select * from
tt7 full join tt8 using (x),
tt7 tt7x full join tt8 tt8x using (x) full join tt8 tt8y using (x);
select pg_get_viewdef('vv4', true);
pg_get_viewdef
-------------------------------------------------------------------------
SELECT v.a, v.b, v.c, v.x, v.e, v.f, v.g +
FROM ( VALUES (1,2,3,4,5,6,7)) v(a, b, c, x, e, f, g) +
UNION ALL +
SELECT x AS a, tt7.y AS b, tt8.z AS c, x_1 AS x, tt7x.y AS e, +
tt8x.z AS f, tt8y.z AS g +
FROM tt7 +
FULL JOIN tt8 USING (x), +
tt7 tt7x(x_1, y) +
FULL JOIN tt8 tt8x(x_1, z) USING (x_1) +
FULL JOIN tt8 tt8y(x_1, z) USING (x_1);
(1 row)
alter table tt7 add column zz int;
alter table tt7 add column z int;
alter table tt7 drop column zz;
alter table tt8 add column z2 int;
select pg_get_viewdef('vv2', true);
pg_get_viewdef
----------------------------------------------------------------------------
SELECT v.a, v.b, v.c, v.d, v.e +
FROM ( VALUES (1,2,3,4,5)) v(a, b, c, d, e) +
UNION ALL +
SELECT x AS a, tt7.y AS b, tt8.z AS c, tt8x.x_1 AS d, tt8x.z AS e+
FROM tt7 +
FULL JOIN tt8 USING (x), tt8 tt8x(x_1, z, z2);
(1 row)
select pg_get_viewdef('vv3', true);
pg_get_viewdef
-------------------------------------------------------------------------
SELECT v.a, v.b, v.c, v.x, v.e, v.f +
FROM ( VALUES (1,2,3,4,5,6)) v(a, b, c, x, e, f) +
UNION ALL +
SELECT x AS a, tt7.y AS b, tt8.z AS c, x_1 AS x, tt7x.y AS e, +
tt8x.z AS f +
FROM tt7 +
FULL JOIN tt8 USING (x), +
tt7 tt7x(x_1, y, z) +
FULL JOIN tt8 tt8x(x_1, z, z2) USING (x_1);
(1 row)
select pg_get_viewdef('vv4', true);
pg_get_viewdef
-------------------------------------------------------------------------
SELECT v.a, v.b, v.c, v.x, v.e, v.f, v.g +
FROM ( VALUES (1,2,3,4,5,6,7)) v(a, b, c, x, e, f, g) +
UNION ALL +
SELECT x AS a, tt7.y AS b, tt8.z AS c, x_1 AS x, tt7x.y AS e, +
tt8x.z AS f, tt8y.z AS g +
FROM tt7 +
FULL JOIN tt8 USING (x), +
tt7 tt7x(x_1, y, z) +
FULL JOIN tt8 tt8x(x_1, z, z2) USING (x_1) +
FULL JOIN tt8 tt8y(x_1, z, z2) USING (x_1);
(1 row)
-- clean up all the random objects we made above
set client_min_messages = warning;
DROP SCHEMA temp_view_test CASCADE;
NOTICE: drop cascades to 27 other objects
DETAIL: drop cascades to table temp_view_test.base_table
drop cascades to view v7_temp
drop cascades to view v10_temp
drop cascades to view v11_temp
drop cascades to view v12_temp
drop cascades to view v2_temp
drop cascades to view v4_temp
drop cascades to view v6_temp
drop cascades to view v8_temp
drop cascades to view v9_temp
drop cascades to table temp_view_test.base_table2
drop cascades to view v5_temp
drop cascades to view temp_view_test.v1
drop cascades to view temp_view_test.v2
drop cascades to view temp_view_test.v3
drop cascades to view temp_view_test.v4
drop cascades to view temp_view_test.v5
drop cascades to view temp_view_test.v6
drop cascades to view temp_view_test.v7
drop cascades to view temp_view_test.v8
drop cascades to sequence temp_view_test.seq1
drop cascades to view temp_view_test.v9
drop cascades to table temp_view_test.tx1
drop cascades to view aliased_view_1
drop cascades to view aliased_view_2
drop cascades to view aliased_view_3
drop cascades to view aliased_view_4
DROP SCHEMA testviewschm2 CASCADE;
NOTICE: drop cascades to 22 other objects
DETAIL: drop cascades to table t1
drop cascades to view temporal1
drop cascades to view temporal2
drop cascades to view temporal3
drop cascades to view temporal4
drop cascades to table t2
drop cascades to view nontemp1
drop cascades to view nontemp2
drop cascades to view nontemp3
drop cascades to view nontemp4
drop cascades to table tbl1
drop cascades to table tbl2
drop cascades to table tbl3
drop cascades to table tbl4
drop cascades to view mytempview
drop cascades to view pubview
drop cascades to view mysecview1
drop cascades to view mysecview2
drop cascades to view mysecview3
drop cascades to view mysecview4
drop cascades to table tt1
drop cascades to table tx1
SET search_path to public;

109
src/test/regress/sql/create_view.sql
Unescape View File

@ -224,7 +224,7 @@ SELECT relname, relkind, reloptions FROM pg_class
'mysecview3'::regclass, 'mysecview4'::regclass)
ORDER BY relname;
-- Test view decompilation in the face of renaming conflicts
-- Test view decompilation in the face of relation renaming conflicts
CREATE TABLE tt1 (f1 int, f2 int, f3 text);
CREATE TABLE tx1 (x1 int, x2 int, x3 text);
@ -286,7 +286,110 @@ ALTER TABLE tmp1 RENAME TO tx1;
\d+ aliased_view_3
\d+ aliased_view_4
-- Test view decompilation in the face of column addition/deletion/renaming
create table tt2 (a int, b int, c int);
create table tt3 (ax int8, b int2, c numeric);
create table tt4 (ay int, b int, q int);
create view v1 as select * from tt2 natural join tt3;
create view v1a as select * from (tt2 natural join tt3) j;
create view v2 as select * from tt2 join tt3 using (b,c) join tt4 using (b);
create view v2a as select * from (tt2 join tt3 using (b,c) join tt4 using (b)) j;
create view v3 as select * from tt2 join tt3 using (b,c) full join tt4 using (b);
select pg_get_viewdef('v1', true);
select pg_get_viewdef('v1a', true);
select pg_get_viewdef('v2', true);
select pg_get_viewdef('v2a', true);
select pg_get_viewdef('v3', true);
alter table tt2 add column d int;
alter table tt2 add column e int;
select pg_get_viewdef('v1', true);
select pg_get_viewdef('v1a', true);
select pg_get_viewdef('v2', true);
select pg_get_viewdef('v2a', true);
select pg_get_viewdef('v3', true);
alter table tt3 rename c to d;
select pg_get_viewdef('v1', true);
select pg_get_viewdef('v1a', true);
select pg_get_viewdef('v2', true);
select pg_get_viewdef('v2a', true);
select pg_get_viewdef('v3', true);
alter table tt3 add column c int;
alter table tt3 add column e int;
select pg_get_viewdef('v1', true);
select pg_get_viewdef('v1a', true);
select pg_get_viewdef('v2', true);
select pg_get_viewdef('v2a', true);
select pg_get_viewdef('v3', true);
alter table tt2 drop column d;
select pg_get_viewdef('v1', true);
select pg_get_viewdef('v1a', true);
select pg_get_viewdef('v2', true);
select pg_get_viewdef('v2a', true);
select pg_get_viewdef('v3', true);
create table tt5 (a int, b int);
create table tt6 (c int, d int);
create view vv1 as select * from (tt5 cross join tt6) j(aa,bb,cc,dd);
select pg_get_viewdef('vv1', true);
alter table tt5 add column c int;
select pg_get_viewdef('vv1', true);
alter table tt5 add column cc int;
select pg_get_viewdef('vv1', true);
alter table tt5 drop column c;
select pg_get_viewdef('vv1', true);
-- Unnamed FULL JOIN USING is lots of fun too
create table tt7 (x int, xx int, y int);
alter table tt7 drop column xx;
create table tt8 (x int, z int);
create view vv2 as
select * from (values(1,2,3,4,5)) v(a,b,c,d,e)
union all
select * from tt7 full join tt8 using (x), tt8 tt8x;
select pg_get_viewdef('vv2', true);
create view vv3 as
select * from (values(1,2,3,4,5,6)) v(a,b,c,x,e,f)
union all
select * from
tt7 full join tt8 using (x),
tt7 tt7x full join tt8 tt8x using (x);
select pg_get_viewdef('vv3', true);
create view vv4 as
select * from (values(1,2,3,4,5,6,7)) v(a,b,c,x,e,f,g)
union all
select * from
tt7 full join tt8 using (x),
tt7 tt7x full join tt8 tt8x using (x) full join tt8 tt8y using (x);
select pg_get_viewdef('vv4', true);
alter table tt7 add column zz int;
alter table tt7 add column z int;
alter table tt7 drop column zz;
alter table tt8 add column z2 int;
select pg_get_viewdef('vv2', true);
select pg_get_viewdef('vv3', true);
select pg_get_viewdef('vv4', true);
-- clean up all the random objects we made above
set client_min_messages = warning;
DROP SCHEMA temp_view_test CASCADE;
DROP SCHEMA testviewschm2 CASCADE;
SET search_path to public;

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