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Commit115296a

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borrow make_inh_translation_list() from postgres
1 parentdd4b33b commit115296a

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1 file changed

+81
-54
lines changed

1 file changed

+81
-54
lines changed

‎src/pg_pathman.c

Lines changed: 81 additions & 54 deletions
Original file line numberDiff line numberDiff line change
@@ -74,9 +74,8 @@ static bool pull_var_param(const WalkerContext *ctx,
7474

7575

7676
/* Misc */
77-
staticList*make_inh_translation_list_simplified(Relationoldrelation,
78-
Relationnewrelation,
79-
Indexnewvarno);
77+
staticvoidmake_inh_translation_list(Relationoldrelation,Relationnewrelation,
78+
Indexnewvarno,List**translated_vars);
8079

8180

8281
/* Copied from allpaths.h */
@@ -165,79 +164,107 @@ _PG_init(void)
165164
}
166165

167166
/*
168-
* Build the list of translations from parent Vars to child Vars
169-
* for an inheritance child.
167+
* make_inh_translation_list
168+
* Build the list of translations from parent Vars to child Vars for
169+
* an inheritance child.
170170
*
171-
* NOTE: Inspired by function make_inh_translation_list().
171+
* For paranoia's sake, we match type/collation as well as attribute name.
172+
*
173+
* NOTE: borrowed from prepunion.c
172174
*/
173-
staticList*
174-
make_inh_translation_list_simplified(Relationoldrelation,
175-
Relationnewrelation,
176-
Indexnewvarno)
175+
staticvoid
176+
make_inh_translation_list(Relationoldrelation,Relationnewrelation,
177+
Indexnewvarno,List**translated_vars)
177178
{
178179
List*vars=NIL;
179180
TupleDescold_tupdesc=RelationGetDescr(oldrelation);
180181
TupleDescnew_tupdesc=RelationGetDescr(newrelation);
181-
intoldnatts=RelationGetNumberOfAttributes(oldrelation);
182-
intnewnatts=RelationGetNumberOfAttributes(newrelation);
182+
intoldnatts=old_tupdesc->natts;
183+
intnewnatts=new_tupdesc->natts;
183184
intold_attno;
184185

185-
/* Amounts of attributes must match */
186-
if (oldnatts!=newnatts)
187-
gotoinh_translation_list_error;
188-
189-
/* We expect that parent and partition have an identical tupdesc */
190186
for (old_attno=0;old_attno<oldnatts;old_attno++)
191187
{
192-
Form_pg_attributeold_att,
193-
new_att;
194-
Oidatttypid;
195-
int32atttypmod;
196-
Oidattcollation;
197-
198-
old_att=old_tupdesc->attrs[old_attno];
199-
new_att=new_tupdesc->attrs[old_attno];
200-
201-
/* Attribute definitions must match */
202-
if (old_att->attisdropped!=new_att->attisdropped||
203-
old_att->atttypid!=new_att->atttypid||
204-
old_att->atttypmod!=new_att->atttypmod||
205-
old_att->attcollation!=new_att->attcollation||
206-
strcmp(NameStr(old_att->attname),NameStr(new_att->attname))!=0)
188+
Form_pg_attributeatt;
189+
char*attname;
190+
Oidatttypid;
191+
int32atttypmod;
192+
Oidattcollation;
193+
intnew_attno;
194+
195+
att=old_tupdesc->attrs[old_attno];
196+
if (att->attisdropped)
207197
{
208-
gotoinh_translation_list_error;
198+
/* Just put NULL into this list entry */
199+
vars=lappend(vars,NULL);
200+
continue;
209201
}
202+
attname=NameStr(att->attname);
203+
atttypid=att->atttypid;
204+
atttypmod=att->atttypmod;
205+
attcollation=att->attcollation;
210206

211-
if (old_att->attisdropped)
207+
/*
208+
* When we are generating the "translation list" for the parent table
209+
* of an inheritance set, no need to search for matches.
210+
*/
211+
if (oldrelation==newrelation)
212212
{
213-
/* Just put NULL into this list entry */
214-
vars=lappend(vars,NULL);
213+
vars=lappend(vars,makeVar(newvarno,
214+
(AttrNumber) (old_attno+1),
215+
atttypid,
216+
atttypmod,
217+
attcollation,
218+
0));
215219
continue;
216220
}
217221

218-
atttypid=old_att->atttypid;
219-
atttypmod=old_att->atttypmod;
220-
attcollation=old_att->attcollation;
222+
/*
223+
* Otherwise we have to search for the matching column by name.
224+
* There's no guarantee it'll have the same column position, because
225+
* of cases like ALTER TABLE ADD COLUMN and multiple inheritance.
226+
* However, in simple cases it will be the same column number, so try
227+
* that before we go groveling through all the columns.
228+
*
229+
* Note: the test for (att = ...) != NULL cannot fail, it's just a
230+
* notational device to include the assignment into the if-clause.
231+
*/
232+
if (old_attno<newnatts&&
233+
(att=new_tupdesc->attrs[old_attno])!=NULL&&
234+
!att->attisdropped&&att->attinhcount!=0&&
235+
strcmp(attname,NameStr(att->attname))==0)
236+
new_attno=old_attno;
237+
else
238+
{
239+
for (new_attno=0;new_attno<newnatts;new_attno++)
240+
{
241+
att=new_tupdesc->attrs[new_attno];
242+
if (!att->attisdropped&&att->attinhcount!=0&&
243+
strcmp(attname,NameStr(att->attname))==0)
244+
break;
245+
}
246+
if (new_attno >=newnatts)
247+
elog(ERROR,"could not find inherited attribute \"%s\" of relation \"%s\"",
248+
attname,RelationGetRelationName(newrelation));
249+
}
250+
251+
/* Found it, check type and collation match */
252+
if (atttypid!=att->atttypid||atttypmod!=att->atttypmod)
253+
elog(ERROR,"attribute \"%s\" of relation \"%s\" does not match parent's type",
254+
attname,RelationGetRelationName(newrelation));
255+
if (attcollation!=att->attcollation)
256+
elog(ERROR,"attribute \"%s\" of relation \"%s\" does not match parent's collation",
257+
attname,RelationGetRelationName(newrelation));
221258

222259
vars=lappend(vars,makeVar(newvarno,
223-
(AttrNumber) (old_attno+1),
260+
(AttrNumber) (new_attno+1),
224261
atttypid,
225262
atttypmod,
226263
attcollation,
227264
0));
228265
}
229266

230-
/* Everything's ok */
231-
returnvars;
232-
233-
/* We end up here if any attribute differs */
234-
inh_translation_list_error:
235-
elog(ERROR,"partition \"%s\" must have exact"
236-
"same structure as parent \"%s\"",
237-
RelationGetRelationName(newrelation),
238-
RelationGetRelationName(oldrelation));
239-
240-
returnNIL;/* keep compiler happy */
267+
*translated_vars=vars;
241268
}
242269

243270
/*
@@ -295,9 +322,9 @@ append_child_relation(PlannerInfo *root, Relation parent_relation,
295322
appinfo->parent_relid=parent_rti;
296323
appinfo->child_relid=childRTindex;
297324
appinfo->parent_reloid=parent_rte->relid;
298-
appinfo->translated_vars=make_inh_translation_list_simplified(parent_relation,
299-
child_relation,
300-
childRTindex);
325+
326+
make_inh_translation_list(parent_relation,child_relation,childRTindex,
327+
&appinfo->translated_vars);
301328

302329
/* Now append 'appinfo' to 'root->append_rel_list' */
303330
root->append_rel_list=lappend(root->append_rel_list,appinfo);

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