greenplumn pseudotypes 源码
greenplumn pseudotypes 代码
文件路径：/src/backend/utils/adt/pseudotypes.c
/*-------------------------------------------------------------------------
*
* pseudotypes.c
* Functions for the system pseudo-types.
*
* A pseudo-type isn't really a type and never has any operations, but
* we do need to supply input and output functions to satisfy the links
* in the pseudo-type's entry in pg_type. In most cases the functions
* just throw an error if invoked. (XXX the error messages here cover
* the most common case, but might be confusing in some contexts. Can
* we do better?)
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/utils/adt/pseudotypes.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "libpq/pqformat.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/rangetypes.h"
/*
* cstring_in - input routine for pseudo-type CSTRING.
*
* We might as well allow this to support constructs like "foo_in('blah')".
*/
Datum
cstring_in(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
PG_RETURN_CSTRING(pstrdup(str));
}
/*
* cstring_out - output routine for pseudo-type CSTRING.
*
* We allow this mainly so that "SELECT some_output_function(...)" does
* what the user will expect.
*/
Datum
cstring_out(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
PG_RETURN_CSTRING(pstrdup(str));
}
/*
* cstring_recv - binary input routine for pseudo-type CSTRING.
*/
Datum
cstring_recv(PG_FUNCTION_ARGS)
{
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
char *str;
int nbytes;
str = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);
PG_RETURN_CSTRING(str);
}
/*
* cstring_send - binary output routine for pseudo-type CSTRING.
*/
Datum
cstring_send(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
StringInfoData buf;
pq_begintypsend(&buf);
pq_sendtext(&buf, str, strlen(str));
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*
* anyarray_in - input routine for pseudo-type ANYARRAY.
*/
Datum
anyarray_in(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of type %s", "anyarray")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* anyarray_out - output routine for pseudo-type ANYARRAY.
*
* We may as well allow this, since array_out will in fact work.
*/
Datum
anyarray_out(PG_FUNCTION_ARGS)
{
return array_out(fcinfo);
}
/*
* anyarray_recv - binary input routine for pseudo-type ANYARRAY.
*
* XXX this could actually be made to work, since the incoming array
* data will contain the element type OID. Need to think through
* type-safety issues before allowing it, however.
*/
Datum
anyarray_recv(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of type %s", "anyarray")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* anyarray_send - binary output routine for pseudo-type ANYARRAY.
*
* We may as well allow this, since array_send will in fact work.
*/
Datum
anyarray_send(PG_FUNCTION_ARGS)
{
return array_send(fcinfo);
}
/*
* anyenum_in - input routine for pseudo-type ANYENUM.
*/
Datum
anyenum_in(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of type %s", "anyenum")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* anyenum_out - output routine for pseudo-type ANYENUM.
*
* We may as well allow this, since enum_out will in fact work.
*/
Datum
anyenum_out(PG_FUNCTION_ARGS)
{
return enum_out(fcinfo);
}
/*
* anyrange_in - input routine for pseudo-type ANYRANGE.
*/
Datum
anyrange_in(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of type %s", "anyrange")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* anyrange_out - output routine for pseudo-type ANYRANGE.
*
* We may as well allow this, since range_out will in fact work.
*/
Datum
anyrange_out(PG_FUNCTION_ARGS)
{
return range_out(fcinfo);
}
/*
* void_in - input routine for pseudo-type VOID.
*
* We allow this so that PL functions can return VOID without any special
* hack in the PL handler. Whatever value the PL thinks it's returning
* will just be ignored.
*/
Datum
void_in(PG_FUNCTION_ARGS)
{
PG_RETURN_VOID(); /* you were expecting something different? */
}
/*
* void_out - output routine for pseudo-type VOID.
*
* We allow this so that "SELECT function_returning_void(...)" works.
*/
Datum
void_out(PG_FUNCTION_ARGS)
{
PG_RETURN_CSTRING(pstrdup(""));
}
/*
* void_recv - binary input routine for pseudo-type VOID.
*
* Note that since we consume no bytes, an attempt to send anything but
* an empty string will result in an "invalid message format" error.
*/
Datum
void_recv(PG_FUNCTION_ARGS)
{
PG_RETURN_VOID();
}
/*
* void_send - binary output routine for pseudo-type VOID.
*
* We allow this so that "SELECT function_returning_void(...)" works
* even when binary output is requested.
*/
Datum
void_send(PG_FUNCTION_ARGS)
{
StringInfoData buf;
/* send an empty string */
pq_begintypsend(&buf);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*
* shell_in - input routine for "shell" types (those not yet filled in).
*/
Datum
shell_in(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of a shell type")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* shell_out - output routine for "shell" types.
*/
Datum
shell_out(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot display a value of a shell type")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* pg_node_tree_in - input routine for type PG_NODE_TREE.
*
* pg_node_tree isn't really a pseudotype --- it's real enough to be a table
* column --- but it presently has no operations of its own, and disallows
* input too, so its I/O functions seem to fit here as much as anywhere.
*/
Datum
pg_node_tree_in(PG_FUNCTION_ARGS)
{
/*
* We disallow input of pg_node_tree values because the SQL functions that
* operate on the type are not secure against malformed input.
*/
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of type %s", "pg_node_tree")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* pg_node_tree_out - output routine for type PG_NODE_TREE.
*
* The internal representation is the same as TEXT, so just pass it off.
*/
Datum
pg_node_tree_out(PG_FUNCTION_ARGS)
{
return textout(fcinfo);
}
/*
* pg_node_tree_recv - binary input routine for type PG_NODE_TREE.
*/
Datum
pg_node_tree_recv(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of type %s", "pg_node_tree")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* pg_node_tree_send - binary output routine for type PG_NODE_TREE.
*/
Datum
pg_node_tree_send(PG_FUNCTION_ARGS)
{
return textsend(fcinfo);
}
/*
* anytable_in - input routine for multiset pseudotype
*/
Datum
anytable_in(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of type anytable")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* anytable_out - output routine for multiset pseudotype.
*/
Datum
anytable_out(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot display a value of type anytable")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* pg_ddl_command_in - input routine for type PG_DDL_COMMAND.
*
* Like pg_node_tree, pg_ddl_command isn't really a pseudotype; it's here for
* the same reasons as that one.
*/
Datum
pg_ddl_command_in(PG_FUNCTION_ARGS)
{
/*
* Disallow input of pg_ddl_command value.
*/
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of type %s", "pg_ddl_command")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* pg_ddl_command_out - output routine for type PG_DDL_COMMAND.
*
* We don't have any good way to output this type directly, so punt.
*/
Datum
pg_ddl_command_out(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot output a value of type %s", "pg_ddl_command")));
PG_RETURN_VOID();
}
/*
* pg_ddl_command_recv - binary input routine for type PG_DDL_COMMAND.
*/
Datum
pg_ddl_command_recv(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of type %s", "pg_ddl_command")));
PG_RETURN_VOID();
}
/*
* pg_ddl_command_send - binary output routine for type PG_DDL_COMMAND.
*/
Datum
pg_ddl_command_send(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot output a value of type %s", "pg_ddl_command")));
PG_RETURN_VOID();
}
/*
* Generate input and output functions for a pseudotype that will reject all
* input and output attempts.
*/
#define PSEUDOTYPE_DUMMY_IO_FUNCS(typname) \
\
Datum \
typname##_in(PG_FUNCTION_ARGS) \
{ \
ereport(ERROR, \
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED), \
errmsg("cannot accept a value of type %s", #typname))); \
\
PG_RETURN_VOID(); /* keep compiler quiet */ \
} \
\
Datum \
typname##_out(PG_FUNCTION_ARGS) \
{ \
ereport(ERROR, \
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED), \
errmsg("cannot display a value of type %s", #typname))); \
\
PG_RETURN_VOID(); /* keep compiler quiet */ \
} \
\
extern int no_such_variable
PSEUDOTYPE_DUMMY_IO_FUNCS(any);
PSEUDOTYPE_DUMMY_IO_FUNCS(trigger);
PSEUDOTYPE_DUMMY_IO_FUNCS(event_trigger);
PSEUDOTYPE_DUMMY_IO_FUNCS(language_handler);
PSEUDOTYPE_DUMMY_IO_FUNCS(fdw_handler);
PSEUDOTYPE_DUMMY_IO_FUNCS(index_am_handler);
PSEUDOTYPE_DUMMY_IO_FUNCS(tsm_handler);
PSEUDOTYPE_DUMMY_IO_FUNCS(internal);
PSEUDOTYPE_DUMMY_IO_FUNCS(opaque);
PSEUDOTYPE_DUMMY_IO_FUNCS(anyelement);
PSEUDOTYPE_DUMMY_IO_FUNCS(anynonarray);
PSEUDOTYPE_DUMMY_IO_FUNCS(table_am_handler);
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