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/*-------------------------------------------------------------------------
*
* pg_dependencies.c
* pg_dependencies data type support.
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/utils/adt/pg_dependencies.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "lib/stringinfo.h"
#include "statistics/extended_stats_internal.h"
#include "statistics/statistics_format.h"
#include "utils/fmgrprotos.h"
/*
* pg_dependencies_in - input routine for type pg_dependencies.
*
* pg_dependencies is real enough to be a table column, but it has no operations
* of its own, and disallows input too
*/
Datum
pg_dependencies_in(PG_FUNCTION_ARGS)
{
/*
* pg_node_list stores the data in binary form and parsing text input is
* not needed, so disallow this.
*/
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of type %s", "pg_dependencies")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* pg_dependencies_out - output routine for type pg_dependencies.
*/
Datum
pg_dependencies_out(PG_FUNCTION_ARGS)
{
bytea *data = PG_GETARG_BYTEA_PP(0);
MVDependencies *dependencies = statext_dependencies_deserialize(data);
StringInfoData str;
initStringInfo(&str);
appendStringInfoChar(&str, '[');
for (int i = 0; i < dependencies->ndeps; i++)
{
MVDependency *dependency = dependencies->deps[i];
if (i > 0)
appendStringInfoString(&str, ", ");
if (dependency->nattributes <= 1)
elog(ERROR, "invalid zero-length nattributes array in MVDependencies");
appendStringInfo(&str, "{\"" PG_DEPENDENCIES_KEY_ATTRIBUTES "\": [%d",
dependency->attributes[0]);
for (int j = 1; j < dependency->nattributes - 1; j++)
appendStringInfo(&str, ", %d", dependency->attributes[j]);
appendStringInfo(&str, "], \"" PG_DEPENDENCIES_KEY_DEPENDENCY "\": %d, "
"\"" PG_DEPENDENCIES_KEY_DEGREE "\": %f}",
dependency->attributes[dependency->nattributes - 1],
dependency->degree);
}
appendStringInfoChar(&str, ']');
PG_RETURN_CSTRING(str.data);
}
/*
* pg_dependencies_recv - binary input routine for type pg_dependencies.
*/
Datum
pg_dependencies_recv(PG_FUNCTION_ARGS)
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of type %s", "pg_dependencies")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
* pg_dependencies_send - binary output routine for type pg_dependencies.
*
* Functional dependencies are serialized in a bytea value (although the type
* is named differently), so let's just send that.
*/
Datum
pg_dependencies_send(PG_FUNCTION_ARGS)
{
return byteasend(fcinfo);
}
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