Function ProcessUtility

src/backend/tcop/utility.c:569–612

* ProcessUtility * general utility function invoker * * pstmt: PlannedStmt wrapper for the utility statement * queryString: original source text of command * readOnlyTree: if true, pstmt's node tree must not be modified * context: identifies source of statement (toplevel client command, * non-toplevel client command, subcommand of a larger utility command) * params: parameters to use dur

 * and stmt_len that were given for the whole statement.
 */
void
ProcessUtility(PlannedStmt *pstmt,
			   const char *queryString,
			   bool readOnlyTree,
			   ProcessUtilityContext context,
			   ParamListInfo params,
			   QueryEnvironment *queryEnv,
			   DestReceiver *dest,
			   QueryCompletion *qc)
{
	Assert(IsA(pstmt, PlannedStmt));
	Assert(pstmt->commandType == CMD_UTILITY);
	Assert(queryString != NULL);	/* required as of 8.4 */
	Assert(qc == NULL || qc->commandTag == CMDTAG_UNKNOWN);

	/*
	 * Greenplum specific code:
	 *   Please refer to the comments at the definition of process_utility_nesting_level.
	 */
	process_utility_nesting_level++;
	PG_TRY();
	{
		/*
		 * We provide a function hook variable that lets loadable plugins get
		 * control when ProcessUtility is called.  Such a plugin would normally
		 * call standard_ProcessUtility().
		 */
		if (ProcessUtility_hook)
			(*ProcessUtility_hook) (pstmt, queryString, readOnlyTree,
								context, params, queryEnv,
								dest, qc);
		else
			standard_ProcessUtility(pstmt, queryString, readOnlyTree,
								context, params, queryEnv,
								dest, qc);
		process_utility_nesting_level--;
	}
	PG_CATCH();
	{
		process_utility_nesting_level--;
		PG_RE_THROW();
	}
	PG_END_TRY();
}

/*
 * standard_ProcessUtility itself deals only with utility commands for