From 139007ea6881f0207b7e73cec498905b7696d9e2 Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Sun, 22 Oct 2023 19:26:25 -0700
Subject: [PATCH] Disabled compression for index tuples with IVFFlat

---
 src/ivfbuild.c  |  2 +-
 src/ivfflat.h   |  1 +
 src/ivfinsert.c |  2 +-
 src/ivfutils.c  | 14 ++++++++++++++
 4 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/ivfbuild.c b/src/ivfbuild.c
index 15ba9aa..533eeb4 100644
--- a/src/ivfbuild.c
+++ b/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);
 
diff --git a/src/ivfflat.h b/src/ivfflat.h
index 1eb35b0..3c86433 100644
--- a/src/ivfflat.h
+++ b/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);
diff --git a/src/ivfinsert.c b/src/ivfinsert.c
index 103fe49..d46d879 100644
--- a/src/ivfinsert.c
+++ b/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 */
diff --git a/src/ivfutils.c b/src/ivfutils.c
index 7959a17..c02be74 100644
--- a/src/ivfutils.c
+++ b/src/ivfutils.c
@@ -238,3 +238,17 @@ IvfflatUpdateList(Relation index, ListInfo listInfo,
 		UnlockReleaseBuffer(buf);
 	}
 }
+
+/*
+ * Get the tuple descriptor
+ */
+TupleDesc
+IvfflatTupleDesc(Relation index)
+{
+	TupleDesc	tupdesc = RelationGetDescr(index);
+
+	/* Prevent compression */
+	TupleDescAttr(tupdesc, 0)->attstorage = TYPSTORAGE_PLAIN;
+
+	return tupdesc;
+}