Обсуждение: pgsql: Fix crash of xmlconcat(NULL) backpatch from 8.4devel

Log Message:
-----------
Fix crash of xmlconcat(NULL)

backpatch from 8.4devel

Tags:
----
REL8_3_STABLE

Modified Files:
--------------
    pgsql/src/backend/executor:
        execQual.c (r1.226 -> r1.226.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execQual.c?r1=1.226&r2=1.226.2.1)
    pgsql/src/test/regress/expected:
        xml.out (r1.20 -> r1.20.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/xml.out?r1=1.20&r2=1.20.2.1)
        xml_1.out (r1.21 -> r1.21.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/xml_1.out?r1=1.21&r2=1.21.2.1)
    pgsql/src/test/regress/sql:
        xml.sql (r1.16 -> r1.16.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/xml.sql?r1=1.16&r2=1.16.2.1)