Define NEON_SMGR in smgr.h to make it possible for extensions to use extetnded Neon SMGR API (#300)

Co-authored-by: Konstantin Knizhnik <[email protected]>

Author: 2 people

src/include/storage/smgr.h

@@ -20,6 +20,12 @@
 
 struct f_smgr;
 
+/*
+ * Neon: extended SMGR API.
+ * This define can be used by extensions to determine that them are built for Neon.
+ */
+#define NEON_SMGR 1
+
 /*
  * smgr.c maintains a table of SMgrRelation objects, which are essentially
  * cached file handles.  An SMgrRelation is created (if not already present)