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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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46
src/backend/catalog/pg_proc.c
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@@ -23,7 +23,9 @@
#include "catalog/pg_namespace.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_proc_fn.h"
#include "catalog/pg_transform.h"
#include "catalog/pg_type.h"
#include "commands/defrem.h"
#include "executor/functions.h"
#include "funcapi.h"
#include "mb/pg_wchar.h"
@@ -59,7 +61,7 @@ static bool match_prosrc_to_literal(const char *prosrc, const char *literal,
/* ----------------------------------------------------------------
* ProcedureCreate
*
* Note: allParameterTypes, parameterModes, parameterNames, and proconfig
* Note: allParameterTypes, parameterModes, parameterNames, trftypes, and proconfig
* are either arrays of the proper types or NULL. We declare them Datum,
* not "ArrayType *", to avoid importing array.h into pg_proc_fn.h.
* ----------------------------------------------------------------
@@ -86,6 +88,7 @@ ProcedureCreate(const char *procedureName,
Datum parameterModes,
Datum parameterNames,
List *parameterDefaults,
Datum trftypes,
Datum proconfig,
float4 procost,
float4 prorows)
@@ -116,6 +119,7 @@ ProcedureCreate(const char *procedureName,
ObjectAddress myself,
referenced;
int i;
Oid trfid;
/*
* sanity checks
@@ -360,6 +364,10 @@ ProcedureCreate(const char *procedureName,
values[Anum_pg_proc_proargdefaults - 1] = CStringGetTextDatum(nodeToString(parameterDefaults));
else
nulls[Anum_pg_proc_proargdefaults - 1] = true;
if (trftypes != PointerGetDatum(NULL))
values[Anum_pg_proc_protrftypes - 1] = trftypes;
else
nulls[Anum_pg_proc_protrftypes - 1] = true;
values[Anum_pg_proc_prosrc - 1] = CStringGetTextDatum(prosrc);
if (probin)
values[Anum_pg_proc_probin - 1] = CStringGetTextDatum(probin);
@@ -624,6 +632,15 @@ ProcedureCreate(const char *procedureName,
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
/* dependency on transform used by return type, if any */
if ((trfid = get_transform_oid(returnType, languageObjectId, true)))
{
referenced.classId = TransformRelationId;
referenced.objectId = trfid;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
/* dependency on parameter types */
for (i = 0; i < allParamCount; i++)
{
@@ -631,6 +648,15 @@ ProcedureCreate(const char *procedureName,
referenced.objectId = allParams[i];
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
/* dependency on transform used by parameter type, if any */
if ((trfid = get_transform_oid(allParams[i], languageObjectId, true)))
{
referenced.classId = TransformRelationId;
referenced.objectId = trfid;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
}
/* dependency on parameter default expressions */
@@ -1128,3 +1154,21 @@ fail:
*newcursorpos = newcp;
return false;
}
List *
oid_array_to_list(Datum datum)
{
ArrayType *array = DatumGetArrayTypeP(datum);
Datum *values;
int nelems;
int i;
List *result = NIL;
deconstruct_array(array,
OIDOID,
sizeof(Oid), true, 'i',
&values, NULL, &nelems);
for (i = 0; i < nelems; i++)
result = lappend_oid(result, values[i]);
return result;
}