Fix XMLTABLE() deparsing to quote namespace names if necessary.

When deparsing an XMLTABLE() expression, XML namespace names were not
quoted. However, since they are parsed as ColLabel tokens, some names
require double quotes to ensure that they are properly interpreted.
Fix by using quote_identifier() in the deparsing code.

Back-patch to all supported versions.

Dean Rasheed, reviewed by Tom Lane.

Discussion: https://postgr.es/m/CAEZATCXTpAS%3DncfLNTZ7YS6O5puHeLg_SUYAit%2Bcs7wsrd9Msg%40mail.gmail.com

diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 993e28a273cb465c3f457d6a197eaa8d65613da3..55330047ccee7d5118b33627a56809d3651ad4e2 100644 (file)
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -10692,7 +10692,8 @@ get_tablefunc(TableFunc *tf, deparse_context *context, bool showimplicit)
            if (ns_node != NULL)
            {
                get_rule_expr(expr, context, showimplicit);
-               appendStringInfo(buf, " AS %s", strVal(ns_node));
+               appendStringInfo(buf, " AS %s",
+                                quote_identifier(strVal(ns_node)));
            }
            else
            {

diff --git a/src/test/regress/expected/xml.out b/src/test/regress/expected/xml.out
index 5b6ae62c044744b499afe6ab8bbb03f648cc30dc..f9b7ec0bab8d49cbb8c4ba6f1974c66628eb1526 100644 (file)
--- a/src/test/regress/expected/xml.out
+++ b/src/test/regress/expected/xml.out
@@ -1149,16 +1149,20 @@ SELECT * FROM XMLTABLE(XMLNAMESPACES('http://x.y' AS zz),
  10
 (1 row)
 
-CREATE VIEW xmltableview2 AS SELECT * FROM XMLTABLE(XMLNAMESPACES('http://x.y' AS zz),
-                      '/zz:rows/zz:row'
+CREATE VIEW xmltableview2 AS SELECT * FROM XMLTABLE(XMLNAMESPACES('http://x.y' AS "Zz"),
+                      '/Zz:rows/Zz:row'
                       PASSING '<rows xmlns="http://x.y"><row><a>10</a></row></rows>'
-                      COLUMNS a int PATH 'zz:a');
+                      COLUMNS a int PATH 'Zz:a');
 SELECT * FROM xmltableview2;
  a  
 ----
  10
 (1 row)
 
+\sv xmltableview2
+CREATE OR REPLACE VIEW public.xmltableview2 AS
+ SELECT "xmltable".a
+   FROM XMLTABLE(XMLNAMESPACES ('http://x.y'::text AS "Zz"), ('/Zz:rows/Zz:row'::text) PASSING ('<rows xmlns="http://x.y"><row><a>10</a></row></rows>'::xml) COLUMNS a integer PATH ('Zz:a'::text))
 SELECT * FROM XMLTABLE(XMLNAMESPACES(DEFAULT 'http://x.y'),
                       '/rows/row'
                       PASSING '<rows xmlns="http://x.y"><row><a>10</a></row></rows>'

diff --git a/src/test/regress/expected/xml_1.out b/src/test/regress/expected/xml_1.out
index 897ed382f12873402460d3a71c316cb16c95c58c..fcf5d0f4aa24accaff004d447783bc2bd0b171d3 100644 (file)
--- a/src/test/regress/expected/xml_1.out
+++ b/src/test/regress/expected/xml_1.out
@@ -1029,10 +1029,10 @@ LINE 3:                       PASSING '<rows xmlns="http://x.y"><row...
                                       ^
 DETAIL:  This functionality requires the server to be built with libxml support.
 HINT:  You need to rebuild PostgreSQL using --with-libxml.
-CREATE VIEW xmltableview2 AS SELECT * FROM XMLTABLE(XMLNAMESPACES('http://x.y' AS zz),
-                      '/zz:rows/zz:row'
+CREATE VIEW xmltableview2 AS SELECT * FROM XMLTABLE(XMLNAMESPACES('http://x.y' AS "Zz"),
+                      '/Zz:rows/Zz:row'
                       PASSING '<rows xmlns="http://x.y"><row><a>10</a></row></rows>'
-                      COLUMNS a int PATH 'zz:a');
+                      COLUMNS a int PATH 'Zz:a');
 ERROR:  unsupported XML feature
 LINE 3:                       PASSING '<rows xmlns="http://x.y"><row...
                                       ^
@@ -1042,6 +1042,8 @@ SELECT * FROM xmltableview2;
 ERROR:  relation "xmltableview2" does not exist
 LINE 1: SELECT * FROM xmltableview2;
                       ^
+\sv xmltableview2
+ERROR:  relation "xmltableview2" does not exist
 SELECT * FROM XMLTABLE(XMLNAMESPACES(DEFAULT 'http://x.y'),
                       '/rows/row'
                       PASSING '<rows xmlns="http://x.y"><row><a>10</a></row></rows>'

diff --git a/src/test/regress/expected/xml_2.out b/src/test/regress/expected/xml_2.out
index 6638458ba2ddc01fb8cbe1cce092dd9784a54150..044a4917d86c1b24e88904be07fc376d0a8e04a3 100644 (file)
--- a/src/test/regress/expected/xml_2.out
+++ b/src/test/regress/expected/xml_2.out
@@ -1135,16 +1135,20 @@ SELECT * FROM XMLTABLE(XMLNAMESPACES('http://x.y' AS zz),
  10
 (1 row)
 
-CREATE VIEW xmltableview2 AS SELECT * FROM XMLTABLE(XMLNAMESPACES('http://x.y' AS zz),
-                      '/zz:rows/zz:row'
+CREATE VIEW xmltableview2 AS SELECT * FROM XMLTABLE(XMLNAMESPACES('http://x.y' AS "Zz"),
+                      '/Zz:rows/Zz:row'
                       PASSING '<rows xmlns="http://x.y"><row><a>10</a></row></rows>'
-                      COLUMNS a int PATH 'zz:a');
+                      COLUMNS a int PATH 'Zz:a');
 SELECT * FROM xmltableview2;
  a  
 ----
  10
 (1 row)
 
+\sv xmltableview2
+CREATE OR REPLACE VIEW public.xmltableview2 AS
+ SELECT "xmltable".a
+   FROM XMLTABLE(XMLNAMESPACES ('http://x.y'::text AS "Zz"), ('/Zz:rows/Zz:row'::text) PASSING ('<rows xmlns="http://x.y"><row><a>10</a></row></rows>'::xml) COLUMNS a integer PATH ('Zz:a'::text))
 SELECT * FROM XMLTABLE(XMLNAMESPACES(DEFAULT 'http://x.y'),
                       '/rows/row'
                       PASSING '<rows xmlns="http://x.y"><row><a>10</a></row></rows>'

diff --git a/src/test/regress/sql/xml.sql b/src/test/regress/sql/xml.sql
index e3f90db4d568d0b0d9a6029c6723b5d85568f621..e908b6c39572d1fce7967fa42c0305a58c43d18d 100644 (file)
--- a/src/test/regress/sql/xml.sql
+++ b/src/test/regress/sql/xml.sql
@@ -393,13 +393,15 @@ SELECT * FROM XMLTABLE(XMLNAMESPACES('http://x.y' AS zz),
                       PASSING '<rows xmlns="http://x.y"><row><a>10</a></row></rows>'
                       COLUMNS a int PATH 'zz:a');
 
-CREATE VIEW xmltableview2 AS SELECT * FROM XMLTABLE(XMLNAMESPACES('http://x.y' AS zz),
-                      '/zz:rows/zz:row'
+CREATE VIEW xmltableview2 AS SELECT * FROM XMLTABLE(XMLNAMESPACES('http://x.y' AS "Zz"),
+                      '/Zz:rows/Zz:row'
                       PASSING '<rows xmlns="http://x.y"><row><a>10</a></row></rows>'
-                      COLUMNS a int PATH 'zz:a');
+                      COLUMNS a int PATH 'Zz:a');
 
 SELECT * FROM xmltableview2;
 
+\sv xmltableview2
+
 SELECT * FROM XMLTABLE(XMLNAMESPACES(DEFAULT 'http://x.y'),
                       '/rows/row'
                       PASSING '<rows xmlns="http://x.y"><row><a>10</a></row></rows>'