1 files changed, 53 insertions, 0 deletions
diff --git a/contrib/btree_gist/btree_gist.c b/contrib/btree_gist/btree_gist.c
new file mode 100644
index 0000000..92520ae
--- /dev/null
+++ b/contrib/btree_gist/btree_gist.c
@@ -0,0 +1,53 @@
+/*
+ * contrib/btree_gist/btree_gist.c
+ */
+#include "postgres.h"
+
+#include "utils/builtins.h"
+
+PG_MODULE_MAGIC;
+
+PG_FUNCTION_INFO_V1(gbt_decompress);
+PG_FUNCTION_INFO_V1(gbtreekey_in);
+PG_FUNCTION_INFO_V1(gbtreekey_out);
+
+/**************************************************
+ * In/Out for keys
+ **************************************************/
+
+
+Datum
+gbtreekey_in(PG_FUNCTION_ARGS)
+{
+	Oid			typioparam = PG_GETARG_OID(1);
+
+	ereport(ERROR,
+			(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+			 errmsg("cannot accept a value of type %s",
+					format_type_extended(typioparam, -1,
+										 FORMAT_TYPE_ALLOW_INVALID))));
+
+	PG_RETURN_VOID();			/* keep compiler quiet */
+}
+
+Datum
+gbtreekey_out(PG_FUNCTION_ARGS)
+{
+	/* Sadly, we do not receive any indication of the specific type */
+	ereport(ERROR,
+			(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+			 errmsg("cannot display a value of type %s", "gbtreekey?")));
+
+	PG_RETURN_VOID();			/* keep compiler quiet */
+}
+
+
+/*
+** GiST DeCompress methods
+** do not do anything.
+*/
+Datum
+gbt_decompress(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_POINTER(PG_GETARG_POINTER(0));
+}