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Commitadd0ea8

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Fix aboriginal mistake in plpython's set-returning-function support.
We must stay in the function's SPI context until done calling the iteratorthat returns the set result. Otherwise, any attempt to invoke SPI featuresin the python code called by the iterator will malfunction. Diagnosis andpatch by Jan Urbanski, per bug report from Jean-Baptiste Quenot.Back-patch to 8.2; there was no support for SRFs in previous versions ofplpython.
1 parent3134d88 commitadd0ea8

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3 files changed

+48
-8
lines changed

3 files changed

+48
-8
lines changed

‎src/pl/plpython/expected/plpython_setof.out‎

Lines changed: 17 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -31,6 +31,14 @@ class producer:
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return self.icontent
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return producer(count, content)
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$$ LANGUAGE plpythonu;
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CREATE FUNCTION test_setof_spi_in_iterator() RETURNS SETOF text AS
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$$
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for s in ('Hello', 'Brave', 'New', 'World'):
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plpy.execute('select 1')
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yield s
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plpy.execute('select 2')
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$$
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LANGUAGE plpythonu;
3442
-- Test set returning functions
3543
SELECT test_setof_as_list(0, 'list');
3644
test_setof_as_list
@@ -107,3 +115,12 @@ SELECT test_setof_as_iterator(2, null);
107115

108116
(2 rows)
109117

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SELECT test_setof_spi_in_iterator();
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test_setof_spi_in_iterator
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----------------------------
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Hello
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Brave
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New
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World
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(4 rows)
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‎src/pl/plpython/plpython.c‎

Lines changed: 20 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -985,7 +985,10 @@ PLy_function_handler(FunctionCallInfo fcinfo, PLyProcedure *proc)
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{
986986
if (!proc->is_setof||proc->setof==NULL)
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{
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/* Simple type returning function or first time for SETOF function */
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/*
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* Simple type returning function or first time for SETOF function:
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* actually execute the function.
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*/
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plargs=PLy_function_build_args(fcinfo,proc);
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plrv=PLy_procedure_call(proc,"args",plargs);
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if (!proc->is_setof)
@@ -1000,14 +1003,10 @@ PLy_function_handler(FunctionCallInfo fcinfo, PLyProcedure *proc)
10001003
}
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10021005
/*
1003-
* Disconnect from SPI manager and then create the return values datum
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* (if the input function does a palloc for it this must not be
1005-
* allocated in the SPI memory context because SPI_finish would free
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* it).
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* If it returns a set, call the iterator to get the next return item.
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* We stay in the SPI context while doing this, because PyIter_Next()
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* calls back into Python code which might contain SPI calls.
10071009
*/
1008-
if (SPI_finish()!=SPI_OK_FINISH)
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elog(ERROR,"SPI_finish failed");
1010-
10111010
if (proc->is_setof)
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{
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boolhas_error= false;
@@ -1064,11 +1063,24 @@ PLy_function_handler(FunctionCallInfo fcinfo, PLyProcedure *proc)
10641063
(errcode(ERRCODE_DATA_EXCEPTION),
10651064
errmsg("error fetching next item from iterator")));
10661065

1066+
/* Disconnect from the SPI manager before returning */
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if (SPI_finish()!=SPI_OK_FINISH)
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elog(ERROR,"SPI_finish failed");
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10671070
fcinfo->isnull= true;
10681071
return (Datum)NULL;
10691072
}
10701073
}
10711074

1075+
/*
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* Disconnect from SPI manager and then create the return values datum
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* (if the input function does a palloc for it this must not be
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* allocated in the SPI memory context because SPI_finish would free
1079+
* it).
1080+
*/
1081+
if (SPI_finish()!=SPI_OK_FINISH)
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elog(ERROR,"SPI_finish failed");
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10721084
plerrcontext.callback=plpython_return_error_callback;
10731085
plerrcontext.previous=error_context_stack;
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error_context_stack=&plerrcontext;

‎src/pl/plpython/sql/plpython_setof.sql‎

Lines changed: 11 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -35,6 +35,15 @@ class producer:
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return producer(count, content)
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$$ LANGUAGE plpythonu;
3737

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CREATEFUNCTIONtest_setof_spi_in_iterator() RETURNS SETOFtextAS
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$$
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for sin ('Hello','Brave','New','World'):
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plpy.execute('select 1')
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yield s
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plpy.execute('select 2')
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$$
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LANGUAGE plpythonu;
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3847

3948
-- Test set returning functions
4049
SELECT test_setof_as_list(0,'list');
@@ -51,3 +60,5 @@ SELECT test_setof_as_iterator(0, 'list');
5160
SELECT test_setof_as_iterator(1,'list');
5261
SELECT test_setof_as_iterator(2,'list');
5362
SELECT test_setof_as_iterator(2,null);
63+
64+
SELECT test_setof_spi_in_iterator();

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