Add helper function to get all chunks of a hypertable

This patch adds a function `ts_chunk_get_by_hypertable_id` to return
a List of all chunks belonging to a hypertable. The returned chunk
objects will not have any constraints or dimension information filled
in.

src/chunk.c

@@ -3160,6 +3160,41 @@ ts_chunk_get_chunk_ids_by_hypertable_id(int32 hypertable_id)
 	return chunkids;
 }
 
+/* Return list of chunks that belong to the given hypertable.
+ *
+ * The returned chunk objects will not have any constraints or dimension
+ * information filled in.
+ */
+List *
+ts_chunk_get_by_hypertable_id(int32 hypertable_id)
+{
+	List *chunks = NIL;
+	Oid hypertable_relid = ts_hypertable_id_to_relid(hypertable_id, false);
+
+	ScanIterator iterator = ts_scan_iterator_create(CHUNK, RowExclusiveLock, CurrentMemoryContext);
+
+	init_scan_by_hypertable_id(&iterator, hypertable_id);
+	ts_scanner_foreach(&iterator)
+	{
+		TupleInfo *ti = ts_scan_iterator_tuple_info(&iterator);
+		Chunk *chunk = palloc0(sizeof(Chunk));
+		ts_chunk_formdata_fill(&chunk->fd, ti);
+
+		chunk->hypertable_relid = hypertable_relid;
+
+		if (!chunk->fd.dropped)
+		{
+			chunk->table_id = ts_get_relation_relid(NameStr(chunk->fd.schema_name),
+													NameStr(chunk->fd.table_name),
+													false);
+		}
+
+		chunks = lappend(chunks, chunk);
+	}
+
+	return chunks;
+}
+
 static ChunkResult
 chunk_recreate_constraint(ChunkScanCtx *ctx, ChunkStub *stub)
 {

src/chunk.h

@@ -225,6 +225,7 @@ extern TSDLLEXPORT bool ts_chunk_contains_compressed_data(const Chunk *chunk);
 extern TSDLLEXPORT ChunkCompressionStatus ts_chunk_get_compression_status(int32 chunk_id);
 extern TSDLLEXPORT Datum ts_chunk_id_from_relid(PG_FUNCTION_ARGS);
 extern TSDLLEXPORT List *ts_chunk_get_chunk_ids_by_hypertable_id(int32 hypertable_id);
+extern TSDLLEXPORT List *ts_chunk_get_by_hypertable_id(int32 hypertable_id);
 
 extern TSDLLEXPORT Chunk *ts_chunk_create_only_table(Hypertable *ht, Hypercube *cube,
 													 const char *schema_name,

src/ts_catalog/compression_settings.c

@@ -176,11 +176,11 @@ ts_compression_settings_rename_column_hypertable(Hypertable *ht, char *old, char
 	if (ht->fd.compressed_hypertable_id)
 	{
 		ListCell *lc;
-		List *chunk_ids = ts_chunk_get_chunk_ids_by_hypertable_id(ht->fd.compressed_hypertable_id);
-		foreach (lc, chunk_ids)
+		List *chunks = ts_chunk_get_by_hypertable_id(ht->fd.compressed_hypertable_id);
+		foreach (lc, chunks)
 		{
-			Oid relid = ts_chunk_get_relid(lfirst_int(lc), false);
-			ts_compression_settings_rename_column(relid, old, new);
+			Chunk *chunk = lfirst(lc);
+			ts_compression_settings_rename_column(chunk->table_id, old, new);
 		}
 	}
 }