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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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39
src/backend/utils/adt/ruleutils.c
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@ -306,6 +306,7 @@ static text *pg_get_expr_worker(text *expr, Oid relid, const char *relname,
static int print_function_arguments(StringInfo buf, HeapTuple proctup,
bool print_table_args, bool print_defaults);
static void print_function_rettype(StringInfo buf, HeapTuple proctup);
static void print_function_trftypes(StringInfo buf, HeapTuple proctup);
static void set_rtable_names(deparse_namespace *dpns, List *parent_namespaces,
Bitmapset *rels_used);
static bool refname_is_unique(char *refname, deparse_namespace *dpns,
@ -1912,9 +1913,7 @@ pg_get_functiondef(PG_FUNCTION_ARGS)
StringInfoData buf;
StringInfoData dq;
HeapTuple proctup;
HeapTuple langtup;
Form_pg_proc proc;
Form_pg_language lang;
Datum tmp;
bool isnull;
const char *prosrc;
@ -1937,12 +1936,6 @@ pg_get_functiondef(PG_FUNCTION_ARGS)
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("\"%s\" is an aggregate function", name)));
/* Need its pg_language tuple for the language name */
langtup = SearchSysCache1(LANGOID, ObjectIdGetDatum(proc->prolang));
if (!HeapTupleIsValid(langtup))
elog(ERROR, "cache lookup failed for language %u", proc->prolang);
lang = (Form_pg_language) GETSTRUCT(langtup);
/*
* We always qualify the function name, to ensure the right function gets
* replaced.
@ -1953,8 +1946,11 @@ pg_get_functiondef(PG_FUNCTION_ARGS)
(void) print_function_arguments(&buf, proctup, false, true);
appendStringInfoString(&buf, ")\n RETURNS ");
print_function_rettype(&buf, proctup);
print_function_trftypes(&buf, proctup);
appendStringInfo(&buf, "\n LANGUAGE %s\n",
quote_identifier(NameStr(lang->lanname)));
quote_identifier(get_language_name(proc->prolang, false)));
/* Emit some miscellaneous options on one line */
oldlen = buf.len;
@ -2074,7 +2070,6 @@ pg_get_functiondef(PG_FUNCTION_ARGS)
appendStringInfoChar(&buf, '\n');
ReleaseSysCache(langtup);
ReleaseSysCache(proctup);
PG_RETURN_TEXT_P(string_to_text(buf.data));
@ -2350,6 +2345,30 @@ is_input_argument(int nth, const char *argmodes)
|| argmodes[nth] == PROARGMODE_VARIADIC);
}
/*
* Append used transformated types to specified buffer
*/
static void
print_function_trftypes(StringInfo buf, HeapTuple proctup)
{
Oid *trftypes;
int ntypes;
ntypes = get_func_trftypes(proctup, &trftypes);
if (ntypes > 0)
{
int i;
appendStringInfoString(buf, "\n TRANSFORM ");
for (i = 0; i < ntypes; i++)
{
if (i != 0)
appendStringInfoString(buf, ", ");
appendStringInfo(buf, "FOR TYPE %s", format_type_be(trftypes[i]));
}
}
}
/*
* Get textual representation of a function argument's default value. The
* second argument of this function is the argument number among all arguments