Fixes review notes

src/backend/distributed/commands/database.c

@@ -191,13 +191,25 @@ PreprocessGrantOnDatabaseStmt(Node *node, const char *queryString,
 }
 
 
+/*
+ * Checks if the provided ALTER DATABASE statement is a SET TABLESPACE statement.
+ *
+ * This function takes a Node pointer representing a AlterDatabaseStmt, and checks
+ * if it is a SET TABLESPACE statement, which is used to move a table to a new
+ * tablespace.
+ *
+ * Parameters:
+ *   stmt: A pointer to a Node representing AlterDatabaseStmt.
+ *
+ * Returns:
+ *   true if the statement is a SET TABLESPACE statement, false otherwise.
+ */
 static bool
 isSetTablespaceStatement(AlterDatabaseStmt *stmt)
 {
-	ListCell *lc = NULL;
-	foreach(lc, stmt->options)
+	DefElem *def = NULL;
+	foreach_ptr(def, stmt->options)
 	{
-		DefElem *def = (DefElem *) lfirst(lc);
 		if (strcmp(def->defname, "tablespace") == 0)
 		{
 			return true;
@@ -290,8 +302,7 @@ PreprocessAlterDatabaseRefreshCollStmt(Node *node, const char *queryString,
  * all workers.
  */
 List *
-PreprocessAlterDatabaseRenameStmt(Node *node, const char *queryString,
-								  ProcessUtilityContext processUtilityContext)
+PostprocessAlterDatabaseRenameStmt(Node *node, const char *queryString)
 {
 	if (!ShouldPropagate())
 	{

src/backend/distributed/commands/distribute_object_ops.c

@@ -524,8 +524,8 @@ static DistributeObjectOps Database_Set = {
 static DistributeObjectOps Database_Rename = {
 	.deparse = DeparseAlterDatabaseRenameStmt,
 	.qualify = NULL,
-	.preprocess = PreprocessAlterDatabaseRenameStmt,
-	.postprocess = NULL,
+	.preprocess = NULL,
+	.postprocess = PostprocessAlterDatabaseRenameStmt,
 	.objectType = OBJECT_DATABASE,
 	.operationType = DIST_OPS_ALTER,
 	.address = NULL,

src/backend/distributed/deparser/deparse_database_stmts.c

@@ -55,7 +55,7 @@ const DefElemOptionFormat create_database_option_formats[] = {
 };
 
 
-const DefElemOptionFormat alter_database_option_formats[] = {
+const DefElemOptionFormat alterDatabaseOptionFormats[] = {
 	{ "is_template", " IS_TEMPLATE %s", OPTION_FORMAT_BOOLEAN },
 	{ "allow_connections", " ALLOW_CONNECTIONS %s", OPTION_FORMAT_BOOLEAN },
 	{ "connection_limit", " CONNECTION LIMIT %d", OPTION_FORMAT_INTEGER },
@@ -147,16 +147,16 @@ AppendGrantOnDatabaseStmt(StringInfo buf, GrantStmt *stmt)
 
 static bool
 AppendBasicAlterDatabaseOptions(StringInfo buf, DefElem *def, bool
-								prefix_appended_for_basic_options, char *dbname)
+								prefixAppendedForBasicOptions, char *dbname)
 {
-	if (!prefix_appended_for_basic_options)
+	if (!prefixAppendedForBasicOptions)
 	{
 		appendStringInfo(buf, "ALTER DATABASE %s WITH", quote_identifier(dbname));
-		prefix_appended_for_basic_options = true;
+		prefixAppendedForBasicOptions = true;
 	}
-	DefElemOptionToStatement(buf, def, alter_database_option_formats, lengthof(
-								 alter_database_option_formats));
-	return prefix_appended_for_basic_options;
+	DefElemOptionToStatement(buf, def, alterDatabaseOptionFormats, lengthof(
+								 alterDatabaseOptionFormats));
+	return prefixAppendedForBasicOptions;
 }
 
 
@@ -175,7 +175,7 @@ AppendAlterDatabaseStmt(StringInfo buf, AlterDatabaseStmt *stmt)
 	if (stmt->options)
 	{
 		ListCell *cell = NULL;
-		bool prefix_appended_for_basic_options = false;
+		bool prefixAppendedForBasicOptions = false;
 		foreach(cell, stmt->options)
 		{
 			DefElem *def = castNode(DefElem, lfirst(cell));
@@ -186,9 +186,9 @@ AppendAlterDatabaseStmt(StringInfo buf, AlterDatabaseStmt *stmt)
 			}
 			else
 			{
-				prefix_appended_for_basic_options = AppendBasicAlterDatabaseOptions(buf,
+				prefixAppendedForBasicOptions = AppendBasicAlterDatabaseOptions(buf,
 																				def,
-																					prefix_appended_for_basic_options,
+																				prefixAppendedForBasicOptions,
 																				stmt->
 																				dbname);
 			}
@@ -247,6 +247,21 @@ DeparseAlterDatabaseRefreshCollStmt(Node *node)
 
 #endif
 
+/*
+ * Deparses an ALTER DATABASE RENAME statement.
+ *
+ * This function takes a Node pointer representing an ALTER DATABASE RENAME
+ * statement, and returns a string that is the SQL representation of that
+ * statement.
+ *
+ * Parameters:
+ *   node: A pointer to a Node representing an ALTER DATABASE RENAME statement.
+ *
+ * Returns:
+ *   A string representing the SQL command to rename a database. The string is
+ *   in the format "ALTER DATABASE <oldname> RENAME TO <newname>", where
+ *   <oldname> and <newname> are the old and new database names, respectively.
+ */
 char *
 DeparseAlterDatabaseRenameStmt(Node *node)
 {

src/backend/distributed/sql/downgrades/citus--12.2-1--12.1-1.sql

@@ -3,4 +3,3 @@
 DROP FUNCTION pg_catalog.citus_internal_database_command(text);
 
 #include "../udfs/citus_add_rebalance_strategy/10.1-1.sql"
-

src/include/distributed/commands.h

@@ -246,9 +246,7 @@ extern List * CreateDatabaseStmtObjectAddress(Node *node, bool missingOk,
 extern List * GenerateGrantDatabaseCommandList(void);
 
 
-extern List * PreprocessAlterDatabaseRenameStmt(Node *node, const char *queryString,
-												ProcessUtilityContext
-												processUtilityContext);
+extern List * PostprocessAlterDatabaseRenameStmt(Node *node, const char *queryString);
 
 extern void EnsureSupportedCreateDatabaseCommand(CreatedbStmt *stmt);
 extern char * CreateDatabaseDDLCommand(Oid dbId);