Fix rename and reindex bugs when objects are not relations

When issuing rename or reindex commands that do not involve
relations, the relation rangevar in the utility statement
will be NULL.

This change adds extra checks to avoid calling, e.g.,
RangeVarGetRelid() when a relation's rangevar is NULL, as
that function does not accept NULL input values.

src/process_utility.c

@@ -148,11 +148,17 @@ process_truncate(Node *parsetree)
 
 	foreach(cell, truncatestmt->relations)
 	{
-		Oid			relId = RangeVarGetRelid(lfirst(cell), NoLock, true);
+		RangeVar   *relation = lfirst(cell);
+		Oid			relid;
 
-		if (OidIsValid(relId))
+		if (NULL == relation)
+			continue;
+
+		relid = RangeVarGetRelid(relation, NoLock, true);
+
+		if (OidIsValid(relid))
 		{
-			Hypertable *ht = hypertable_cache_get_entry(hcache, relId);
+			Hypertable *ht = hypertable_cache_get_entry(hcache, relid);
 
 			if (ht != NULL)
 			{
@@ -172,7 +178,7 @@ process_alterobjectschema(Node *parsetree)
 	Cache	   *hcache;
 	Hypertable *ht;
 
-	if (alterstmt->objectType != OBJECT_TABLE)
+	if (alterstmt->objectType != OBJECT_TABLE || NULL == alterstmt->relation)
 		return;
 
 	relid = RangeVarGetRelid(alterstmt->relation, NoLock, true);
@@ -202,7 +208,7 @@ process_copy(Node *parsetree, const char *query_string, char *completion_tag)
 	Cache	   *hcache;
 	Oid			relid;
 
-	if (!stmt->is_from)
+	if (!stmt->is_from || NULL == stmt->relation)
 		return false;
 
 	relid = RangeVarGetRelid(stmt->relation, NoLock, true);
@@ -326,7 +332,13 @@ process_drop_table(DropStmt *stmt)
 	foreach(lc, stmt->objects)
 	{
 		List	   *object = lfirst(lc);
-		Oid			relid = RangeVarGetRelid(makeRangeVarFromNameList(object), NoLock, true);
+		RangeVar   *relation = makeRangeVarFromNameList(object);
+		Oid			relid;
+
+		if (NULL == relation)
+			continue;
+
+		relid = RangeVarGetRelid(relation, NoLock, true);
 
 		if (OidIsValid(relid))
 		{
@@ -428,8 +440,13 @@ process_drop_index(DropStmt *stmt)
 	foreach(lc, stmt->objects)
 	{
 		List	   *object = lfirst(lc);
-		RangeVar   *rv = makeRangeVarFromNameList(object);
-		Oid			idxrelid = RangeVarGetRelid(rv, NoLock, true);
+		RangeVar   *relation = makeRangeVarFromNameList(object);
+		Oid			idxrelid;
+
+		if (NULL == relation)
+			continue;
+
+		idxrelid = RangeVarGetRelid(relation, NoLock, true);
 
 		if (OidIsValid(idxrelid))
 		{
@@ -511,7 +528,16 @@ static bool
 process_reindex(Node *parsetree)
 {
 	ReindexStmt *stmt = (ReindexStmt *) parsetree;
-	Oid			relid = RangeVarGetRelid(stmt->relation, NoLock, true);
+	Oid			relid;
+
+	if (NULL == stmt->relation)
+		/* Not a case we are interested in */
+		return false;
+
+	relid = RangeVarGetRelid(stmt->relation, NoLock, true);
+
+	if (!OidIsValid(relid))
+		return false;
 
 	switch (stmt->kind)
 	{
@@ -571,8 +597,13 @@ process_rename_column(Cache *hcache, Oid relid, RenameStmt *stmt)
 static void
 process_rename_index(Cache *hcache, Oid relid, RenameStmt *stmt)
 {
-	Oid			tablerelid = IndexGetRelation(relid, false);
-	Hypertable *ht = hypertable_cache_get_entry(hcache, tablerelid);
+	Oid			tablerelid = IndexGetRelation(relid, true);
+	Hypertable *ht;
+
+	if (!OidIsValid(tablerelid))
+		return;
+
+	ht = hypertable_cache_get_entry(hcache, tablerelid);
 
 	if (NULL != ht)
 		chunk_index_rename_parent(ht, relid, stmt->newname);
@@ -589,14 +620,20 @@ static void
 process_rename(Node *parsetree)
 {
 	RenameStmt *stmt = (RenameStmt *) parsetree;
-	Oid			relid = RangeVarGetRelid(stmt->relation, NoLock, true);
+	Oid			relid;
 	Cache	   *hcache;
 
-	/* TODO: forbid all rename op on chunk table */
+	if (NULL == stmt->relation)
+		/* Not an object we are interested in */
+		return;
+
+	relid = RangeVarGetRelid(stmt->relation, NoLock, true);
 
 	if (!OidIsValid(relid))
 		return;
 
+	/* TODO: forbid all rename op on chunk table */
+
 	hcache = hypertable_cache_pin();
 
 	switch (stmt->renameType)

test/expected/plain.out

@@ -0,0 +1,44 @@
+\ir include/create_single_db.sql
+SET client_min_messages = WARNING;
+DROP DATABASE IF EXISTS single;
+SET client_min_messages = NOTICE;
+CREATE DATABASE single;
+\c single
+CREATE EXTENSION IF NOT EXISTS timescaledb;
+SET timescaledb.disable_optimizations = :DISABLE_OPTIMIZATIONS;
+-- Tests for plain PostgreSQL commands to ensure that they work while
+-- the TimescaleDB extension is loaded. This is a mix of statements
+-- added mostly as regression checks when bugs are discovered and
+-- fixed.
+CREATE TABLE regular_table(time timestamp, temp float8, tag text, color integer);
+-- Renaming indexes should work
+CREATE INDEX time_color_idx ON regular_table(time, color);
+ALTER INDEX time_color_idx RENAME TO time_color_idx2;
+\d+ regular_table
+                               Table "public.regular_table"
+ Column |            Type             | Modifiers | Storage  | Stats target | Description 
+--------+-----------------------------+-----------+----------+--------------+-------------
+ time   | timestamp without time zone |           | plain    |              | 
+ temp   | double precision            |           | plain    |              | 
+ tag    | text                        |           | extended |              | 
+ color  | integer                     |           | plain    |              | 
+Indexes:
+    "time_color_idx2" btree ("time", color)
+
+-- Renaming types should work
+CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple');
+ALTER TYPE rainbow RENAME TO colors;
+\dT+
+                                       List of data types
+ Schema |  Name  | Internal name | Size | Elements |  Owner   | Access privileges | Description 
+--------+--------+---------------+------+----------+----------+-------------------+-------------
+ public | colors | colors        | 4    | red     +| postgres |                   | 
+        |        |               |      | orange  +|          |                   | 
+        |        |               |      | yellow  +|          |                   | 
+        |        |               |      | green   +|          |                   | 
+        |        |               |      | blue    +|          |                   | 
+        |        |               |      | purple   |          |                   | 
+(1 row)
+
+REINDEX TABLE regular_table;
+REINDEX SCHEMA public;

test/sql/plain.sql

@@ -0,0 +1,23 @@
+\ir include/create_single_db.sql
+
+-- Tests for plain PostgreSQL commands to ensure that they work while
+-- the TimescaleDB extension is loaded. This is a mix of statements
+-- added mostly as regression checks when bugs are discovered and
+-- fixed.
+
+CREATE TABLE regular_table(time timestamp, temp float8, tag text, color integer);
+
+-- Renaming indexes should work
+CREATE INDEX time_color_idx ON regular_table(time, color);
+ALTER INDEX time_color_idx RENAME TO time_color_idx2;
+
+\d+ regular_table
+
+-- Renaming types should work
+CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple');
+ALTER TYPE rainbow RENAME TO colors;
+
+\dT+
+
+REINDEX TABLE regular_table;
+REINDEX SCHEMA public;