Function command_db_stats

pg_documentdb/src/commands/db_stats.c:81–119

* command_db_stats is the implementation of the internal logic for * dbcommand/dbStats. */

 * dbcommand/dbStats.
 */
Datum
command_db_stats(PG_FUNCTION_ARGS)
{
	if (PG_ARGISNULL(0))
	{
		ereport(ERROR, (errmsg("Database name must not be NULL")));
	}
	Datum databaseName = PG_GETARG_DATUM(0);

	if (PG_ARGISNULL(1))
	{
		/* Scale is optional in the dbStats command but here
		 * the sql method must provide scale to this C func */
		ereport(ERROR, (errmsg("scale cannot be NULL")));
	}
	double scaleDouble = PG_GETARG_FLOAT8(1);

	if (PG_ARGISNULL(2))
	{
		/* freeStorage is optional in the dbStats command but here
		 * the sql method must provide freeStorage to this C func */
		ereport(ERROR, (errmsg("freeStorage cannot be NULL")));
	}

	/* We don't yet support freeStrorage statistics, so skip reading freeStorage value */

	ReportFeatureUsage(FEATURE_COMMAND_DBSTATS);

	/* Truncate the fractional part of the scale */
	scaleDouble = trunc(scaleDouble);

	/* The 'scale' value is capped to int32 for compatibility with expected behavior */
	int32 scale = scaleDouble > INT32_MAX ? INT32_MAX :
				  scaleDouble < INT32_MIN ? INT32_MIN :
				  (int32) scaleDouble;

	pgbson *response = DbStatsCoordinator(databaseName, scale);
	PG_RETURN_POINTER(response);
}


/*