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-rw-r--r--src/include/common/compression.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/include/common/compression.h b/src/include/common/compression.h
index 9a471e40aab..b48c173022e 100644
--- a/src/include/common/compression.h
+++ b/src/include/common/compression.h
@@ -14,6 +14,10 @@
#ifndef PG_COMPRESSION_H
#define PG_COMPRESSION_H
+/*
+ * These values are stored in disk, for example in files generated by pg_dump.
+ * Create the necessary backwards compatibility layers if their order changes.
+ */
typedef enum pg_compress_algorithm
{
PG_COMPRESSION_NONE,