Use FreeTupleDesc

src/ivfbuild.c

@@ -287,7 +287,7 @@ InsertTuples(Relation index, IvfflatBuildState * buildstate, ForkNumber forkNum)
 #else
 	TupleTableSlot *slot = MakeSingleTupleTableSlot(buildstate->tupdesc);
 #endif
-	TupleDesc	tupdesc = RelationGetDescr(index);
+	TupleDesc	tupdesc = IvfflatTupleDesc(index);
 
 	UpdateProgress(PROGRESS_CREATEIDX_SUBPHASE, PROGRESS_IVFFLAT_PHASE_LOAD);
 
@@ -339,6 +339,8 @@ InsertTuples(Relation index, IvfflatBuildState * buildstate, ForkNumber forkNum)
 		/* Set the start and insert pages */
 		IvfflatUpdateList(index, buildstate->listInfo[i], insertPage, InvalidBlockNumber, startPage, forkNum);
 	}
+
+	FreeTupleDesc(tupdesc);
 }
 
 /*

src/ivfflat.h

@@ -287,6 +287,7 @@ void		IvfflatInitPage(Buffer buf, Page page);
 void		IvfflatInitRegisterPage(Relation index, Buffer *buf, Page *page, GenericXLogState **state);
 void		IvfflatInit(void);
 PGDLLEXPORT void IvfflatParallelBuildMain(dsm_segment *seg, shm_toc *toc);
+TupleDesc	IvfflatTupleDesc(Relation index);
 
 /* Index access methods */
 IndexBuildResult *ivfflatbuild(Relation heap, Relation index, IndexInfo *indexInfo);

src/ivfinsert.c

@@ -94,7 +94,7 @@ InsertTuple(Relation index, Datum *values, bool *isnull, ItemPointer heap_tid, R
 	originalInsertPage = insertPage;
 
 	/* Form tuple */
-	itup = index_form_tuple(RelationGetDescr(index), &value, isnull);
+	itup = index_form_tuple(IvfflatTupleDesc(index), &value, isnull);
 	itup->t_tid = *heap_tid;
 
 	/* Get tuple size */

src/ivfutils.c

@@ -4,6 +4,10 @@
 #include "storage/bufmgr.h"
 #include "vector.h"
 
+#if PG_VERSION_NUM < 130000
+#define TYPSTORAGE_PLAIN 'p'
+#endif
+
 /*
  * Allocate a vector array
  */
@@ -238,3 +242,17 @@ IvfflatUpdateList(Relation index, ListInfo listInfo,
 		UnlockReleaseBuffer(buf);
 	}
 }
+
+/*
+ * Get the tuple descriptor
+ */
+TupleDesc
+IvfflatTupleDesc(Relation index)
+{
+	TupleDesc	tupdesc = CreateTupleDescCopyConstr(RelationGetDescr(index));
+
+	/* Prevent compression */
+	TupleDescAttr(tupdesc, 0)->attstorage = TYPSTORAGE_PLAIN;
+
+	return tupdesc;
+}