PostGIS  2.5.0dev-r@@SVN_REVISION@@
Datum pgis_geometry_union_finalfn ( PG_FUNCTION_ARGS  )

Definition at line 229 of file lwgeom_accum.c.

References pgis_accum_finalfn(), pgis_union_geometry_array(), and PGISDirectFunctionCall1().

230 {
231  pgis_abs *p;
232  Datum result = 0;
233  Datum geometry_array = 0;
234 
235  if (PG_ARGISNULL(0))
236  PG_RETURN_NULL(); /* returns null iff no input values */
237 
238  p = (pgis_abs*) PG_GETARG_POINTER(0);
239 
240  geometry_array = pgis_accum_finalfn(p, CurrentMemoryContext, fcinfo);
241  result = PGISDirectFunctionCall1( pgis_union_geometry_array, geometry_array );
242  if (!result)
243  PG_RETURN_NULL();
244 
245  PG_RETURN_DATUM(result);
246 }
Datum pgis_accum_finalfn(pgis_abs *p, MemoryContext mctx, FunctionCallInfo fcinfo)
The final function rescues the built array from the side memory context using the PostgreSQL built-in...
Definition: lwgeom_accum.c:182
Datum pgis_union_geometry_array(PG_FUNCTION_ARGS)
Datum PGISDirectFunctionCall1(PGFunction func, Datum arg1)
A modified version of PostgreSQL's DirectFunctionCall1 which allows NULL results; this is required fo...
Definition: lwgeom_accum.c:384
To pass the internal ArrayBuildState pointer between the transfn and finalfn we need to wrap it into ...
Definition: lwgeom_accum.c:83

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