Backpatch introduction of TupleDescAttr(tupdesc, i).

2cd70845240 / c6293249d change the way individual attributes in a
TupleDesc are stored / accessed.  To reduce the effort of making
extensions compatible with postgresql 11, and to ease future
backpatching, backpatch introduction of TupleDescAttr() to all
releases.  Do not backpatch change in storage, as that'd be a breaking
change for existing and working extensions.

Author: Andres Freund
Discussion: https://postgr.es/m/20170820181723.tdswdinzptbcwhrr@alap3.anarazel.de
Backpatch: 9.2-

diff --git a/src/include/access/tupdesc.h b/src/include/access/tupdesc.h
index e7065d70baadd8db7b5ba596a9f421464fc5c271..ef73976342c1d2a3bd983300b01884ecc2a6f8e9 100644 (file)
--- a/src/include/access/tupdesc.h
+++ b/src/include/access/tupdesc.h
@@ -81,6 +81,9 @@ typedef struct tupleDesc
 }                 *TupleDesc;
 
 
+/* Accessor for the i'th attribute of tupdesc. */
+#define TupleDescAttr(tupdesc, i) ((tupdesc)->attrs[(i)])
+
 extern TupleDesc CreateTemplateTupleDesc(int natts, bool hasoid);
 
 extern TupleDesc CreateTupleDesc(int natts, bool hasoid,