pgsql: Setup cursor position for schema-qualified elements

Setup cursor position for schema-qualified elements

This makes any errors thrown while looking up such schemas report the
position of the error.

Author: Ryan Kelly
Reviewed by: Jeevan Chalke, Tom Lane

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/b8d226b4f9691c7afb986dbaaf3f6ff7b203d1b5

Modified Files
--------------
src/backend/parser/parse_func.c | 7 +++++++
src/backend/parser/parse_oper.c | 24 ++++++++++++++++++------
src/backend/parser/parse_type.c | 5 +++++
src/backend/parser/parse_utilcmd.c | 13 +++++++++----
src/test/regress/expected/create_table.out | 4 ++++
5 files changed, 43 insertions(+), 10 deletions(-)