greenplumn ltree_plpython 源码
greenplumn ltree_plpython 代码
文件路径：/contrib/ltree_plpython/ltree_plpython.c
#include "postgres.h"
#include "fmgr.h"
#include "plpython.h"
#include "ltree/ltree.h"
PG_MODULE_MAGIC;
extern void _PG_init(void);
/* Linkage to functions in plpython module */
#if PY_MAJOR_VERSION >= 3
typedef PyObject *(*PLyUnicode_FromStringAndSize_t) (const char *s, Py_ssize_t size);
static PLyUnicode_FromStringAndSize_t PLyUnicode_FromStringAndSize_p;
#endif
/*
* Module initialize function: fetch function pointers for cross-module calls.
*/
void
_PG_init(void)
{
/* Asserts verify that typedefs above match original declarations */
#if PY_MAJOR_VERSION >= 3
AssertVariableIsOfType(&PLyUnicode_FromStringAndSize, PLyUnicode_FromStringAndSize_t);
PLyUnicode_FromStringAndSize_p = (PLyUnicode_FromStringAndSize_t)
load_external_function("$libdir/" PLPYTHON_LIBNAME, "PLyUnicode_FromStringAndSize",
true, NULL);
#endif
}
/* These defines must be after the module init function */
#define PLyUnicode_FromStringAndSize PLyUnicode_FromStringAndSize_p
PG_FUNCTION_INFO_V1(ltree_to_plpython);
Datum
ltree_to_plpython(PG_FUNCTION_ARGS)
{
ltree *in = PG_GETARG_LTREE_P(0);
int i;
PyObject *list;
ltree_level *curlevel;
list = PyList_New(in->numlevel);
if (!list)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
curlevel = LTREE_FIRST(in);
for (i = 0; i < in->numlevel; i++)
{
PyList_SetItem(list, i, PyString_FromStringAndSize(curlevel->name, curlevel->len));
curlevel = LEVEL_NEXT(curlevel);
}
PG_FREE_IF_COPY(in, 0);
return PointerGetDatum(list);
}
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