Generalizes the lazy fetch added in GH-15287 by letting a statement choose
how many rows it fetches per chunk, trading memory for speed. ext/pgsql
already exposed this as pg_set_chunked_rows_size(); ext/pdo_pgsql had no
way to reach it.
ATTR_PREFETCH and ATTR_CHUNK_SIZE replace each other: setting one on the
connection clears the other, a statement given either does not inherit the
connection's value, and a chunk size of 1 or more wins when both are set on
the same statement. A chunk size cannot be combined with a statement-level
PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL, which throws a ValueError; a
connection-level chunk size is simply disabled by a scrollable statement.
Requires libpq 17 or later.
Close GH-23210
This moves the new method from magically being added to the PDO class from the driver to just be available on the dedicated subclass.
Drive-by fixes to NEWS and UPGRADING
武田 憲太郎