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 780fe8e6889252847067283cd4ac6d25d8cf0411..7e96e0685932619cdbe013aefaedea5555599128 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,