Обсуждение: pgsql: Prevent failure when RowExpr or XmlExpr is parse-analyzed twice.

Prevent failure when RowExpr or XmlExpr is parse-analyzed twice.

transformExpr() is required to cope with already-transformed expression
trees, for various ugly-but-not-quite-worth-cleaning-up reasons.  However,
some of its newer subroutines hadn't gotten the memo.  This accounts for
bug #7763 from Norbert Buchmuller: transformRowExpr() was overwriting the
previously determined type of a RowExpr during CREATE TABLE LIKE INCLUDING
INDEXES.  Additional investigation showed that transformXmlExpr had the
same kind of problem, but all the other cases seem to be safe.

Andres Freund and Tom Lane

Branch
------
REL8_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/4297f1732f7bf8f45f81a5e996d8333f2863a3d3

Modified Files
--------------
src/backend/parser/gram.y       |    3 +++
src/backend/parser/parse_expr.c |   19 +++++++++++++++++--
2 files changed, 20 insertions(+), 2 deletions(-)