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Add transforms feature

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This provides a mechanism for specifying conversions between SQL data
types and procedural languages.  As examples, there are transforms
for hstore and ltree for PL/Perl and PL/Python.

reviews by Pavel Stěhule and Andres Freund
This commit is contained in:
Peter Eisentraut
2015-04-26 10:33:14 -04:00
parent f320cbb615
commit cac7658205
101 changed files with 6034 additions and 2811 deletions
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32
contrib/ltree_plpython/ltree_plpython.c Normal file
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#include "postgres.h"
#include "fmgr.h"
#include "plpython.h"
#include "ltree.h"
PG_MODULE_MAGIC;
PG_FUNCTION_INFO_V1(ltree_to_plpython);
Datum ltree_to_plpython(PG_FUNCTION_ARGS);
Datum
ltree_to_plpython(PG_FUNCTION_ARGS)
{
ltree *in = PG_GETARG_LTREE(0);
int i;
PyObject *list;
ltree_level *curlevel;
list = PyList_New(in->numlevel);
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);
}