Обсуждение: pgsql: Fix aboriginal mistake in plpython's set-returning-function supp

Fix aboriginal mistake in plpython's set-returning-function support.

We must stay in the function's SPI context until done calling the iterator
that returns the set result.  Otherwise, any attempt to invoke SPI features
in the python code called by the iterator will malfunction.  Diagnosis and
patch by Jan Urbanski, per bug report from Jean-Baptiste Quenot.

Back-patch to 8.2; there was no support for SRFs in previous versions of
plpython.

Branch
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REL8_2_STABLE

Details
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http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=0c6c5b8a2d94c3ee74e7bba5eedcaae64471e463

Modified Files
--------------
src/pl/plpython/expected/plpython_function.out |    8 ++++++
src/pl/plpython/expected/plpython_test.out     |    9 +++++++
src/pl/plpython/plpython.c                     |   28 +++++++++++++++++------
src/pl/plpython/sql/plpython_function.sql      |    9 +++++++
src/pl/plpython/sql/plpython_test.sql          |    2 +
5 files changed, 48 insertions(+), 8 deletions(-)