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Commit486cfb3

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Fix parsetree representation of XMLTABLE(XMLNAMESPACES(DEFAULT ...)).
The original coding for XMLTABLE thought it could represent a defaultnamespace by a T_String Value node with a null string pointer. That'snot okay, though; in particular outfuncs.c/readfuncs.c are not on boardwith such a representation, meaning you'll get a null pointer crashif you try to store a view or rule containing this construct.To fix, change the parsetree representation so that we have a NULLlist element, instead of a bogus Value node.This isn't really a functional limitation since default XML namespacesaren't yet implemented in the executor; you'd just get "DEFAULTnamespace is not supported" anyway. But crashes are not nice, soback-patch to v10 where this syntax was added. Ordinarily we'd considera parsetree representation change to be un-backpatchable; but sinceexisting releases would crash on the way to storing such constructs,there can't be any existing views/rules to be incompatible with.Per report from Andrey Lepikhov.Discussion:https://postgr.es/m/3690074f-abd2-56a9-144a-aa5545d7a291@postgrespro.ru
1 parentd45f157 commit486cfb3

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5 files changed

+23
-15
lines changed

5 files changed

+23
-15
lines changed

‎src/backend/executor/nodeTableFuncscan.c

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -364,8 +364,9 @@ tfuncInitialize(TableFuncScanState *tstate, ExprContext *econtext, Datum doc)
364364
forboth(lc1,tstate->ns_uris,lc2,tstate->ns_names)
365365
{
366366
ExprState*expr= (ExprState*)lfirst(lc1);
367-
char*ns_name=strVal(lfirst(lc2));
367+
Value*ns_node=(Value*)lfirst(lc2);
368368
char*ns_uri;
369+
char*ns_name;
369370

370371
value=ExecEvalExpr((ExprState*)expr,econtext,&isnull);
371372
if (isnull)
@@ -374,6 +375,9 @@ tfuncInitialize(TableFuncScanState *tstate, ExprContext *econtext, Datum doc)
374375
errmsg("namespace URI must not be null")));
375376
ns_uri=TextDatumGetCString(value);
376377

378+
/* DEFAULT is passed down to SetNamespace as NULL */
379+
ns_name=ns_node ?strVal(ns_node) :NULL;
380+
377381
routine->SetNamespace(tstate,ns_name,ns_uri);
378382
}
379383

‎src/backend/parser/parse_clause.c

Lines changed: 8 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -779,7 +779,7 @@ transformRangeTableFunc(ParseState *pstate, RangeTableFunc *rtf)
779779
/* undef ordinality column number */
780780
tf->ordinalitycol=-1;
781781

782-
782+
/* Process column specs */
783783
names=palloc(sizeof(char*)*list_length(rtf->columns));
784784

785785
colno=0;
@@ -900,15 +900,15 @@ transformRangeTableFunc(ParseState *pstate, RangeTableFunc *rtf)
900900
{
901901
foreach(lc2,ns_names)
902902
{
903-
char*name=strVal(lfirst(lc2));
903+
Value*ns_node=(Value*)lfirst(lc2);
904904

905-
if (name==NULL)
905+
if (ns_node==NULL)
906906
continue;
907-
if (strcmp(name,r->name)==0)
907+
if (strcmp(strVal(ns_node),r->name)==0)
908908
ereport(ERROR,
909909
(errcode(ERRCODE_SYNTAX_ERROR),
910910
errmsg("namespace name \"%s\" is not unique",
911-
name),
911+
r->name),
912912
parser_errposition(pstate,r->location)));
913913
}
914914
}
@@ -922,8 +922,9 @@ transformRangeTableFunc(ParseState *pstate, RangeTableFunc *rtf)
922922
default_ns_seen= true;
923923
}
924924

925-
/* Note the string may be NULL */
926-
ns_names=lappend(ns_names,makeString(r->name));
925+
/* We represent DEFAULT by a null pointer */
926+
ns_names=lappend(ns_names,
927+
r->name ?makeString(r->name) :NULL);
927928
}
928929

929930
tf->ns_uris=ns_uris;

‎src/backend/utils/adt/ruleutils.c

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -9739,17 +9739,17 @@ get_tablefunc(TableFunc *tf, deparse_context *context, bool showimplicit)
97399739
forboth(lc1,tf->ns_uris,lc2,tf->ns_names)
97409740
{
97419741
Node*expr= (Node*)lfirst(lc1);
9742-
char*name=strVal(lfirst(lc2));
9742+
Value*ns_node=(Value*)lfirst(lc2);
97439743

97449744
if (!first)
97459745
appendStringInfoString(buf,", ");
97469746
else
97479747
first= false;
97489748

9749-
if (name!=NULL)
9749+
if (ns_node!=NULL)
97509750
{
97519751
get_rule_expr(expr,context,showimplicit);
9752-
appendStringInfo(buf," AS %s",name);
9752+
appendStringInfo(buf," AS %s",strVal(ns_node));
97539753
}
97549754
else
97559755
{

‎src/include/nodes/execnodes.h

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1564,8 +1564,8 @@ typedef struct TableFuncScanState
15641564
ExprState*rowexpr;/* state for row-generating expression */
15651565
List*colexprs;/* state for column-generating expression */
15661566
List*coldefexprs;/* state for column default expressions */
1567-
List*ns_names;/*list of str nodes with namespace names */
1568-
List*ns_uris;/* list of states of namespaceuri exprs */
1567+
List*ns_names;/*same as TableFunc.ns_names */
1568+
List*ns_uris;/* list of states of namespaceURI exprs */
15691569
Bitmapset*notnulls;/* nullability flag for each output column */
15701570
void*opaque;/* table builder private space */
15711571
conststructTableFuncRoutine*routine;/* table builder methods */

‎src/include/nodes/primnodes.h

Lines changed: 5 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -75,12 +75,15 @@ typedef struct RangeVar
7575

7676
/*
7777
* TableFunc - node for a table function, such as XMLTABLE.
78+
*
79+
* Entries in the ns_names list are either string Value nodes containing
80+
* literal namespace names, or NULL pointers to represent DEFAULT.
7881
*/
7982
typedefstructTableFunc
8083
{
8184
NodeTagtype;
82-
List*ns_uris;/* list of namespaceuri */
83-
List*ns_names;/* list of namespace names */
85+
List*ns_uris;/* list of namespaceURI expressions */
86+
List*ns_names;/* list of namespace namesor NULL*/
8487
Node*docexpr;/* input document expression */
8588
Node*rowexpr;/* row filter expression */
8689
List*colnames;/* column names (list of String) */

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