Always double-quote column names in the AS (...) clause generated by
buildCypher() and _validate_column(). This prevents PostgreSQL parse
errors when column aliases happen to be reserved words (e.g. 'count',
'order', 'type', 'group', 'select').

Before: SELECT * from cypher(NULL,NULL) as (count agtype);
After:  SELECT * from cypher(NULL,NULL) as ("count" agtype);

PostgreSQL always accepts double-quoted identifiers, so quoting
unconditionally is safe for all names — no reserved word list needed.

Closes apache#2370

suggested changes Apr 5, 2026

- _validate_column: add comment explaining why type_name is
  intentionally left unquoted (PG type names are case-insensitive)
- buildCypher: fix graphName == None to idiomatic 'is None'
- test_reserved_word_count: replace fragile assertNotIn with regex
- Add test for reserved word in "name type" pair (e.g. "order agtype")
- Add comment explaining intentional _validate_column private import

Made-with: Cursor

- Update test_security.py assertions to expect double-quoted column
  names (consistent with the always-quote-column-names change)
- Reword type_name comment to clarify case-folding semantics

Made-with: Cursor