Get the hash access method compiling

This is totally broken still, but hey, it compiles.
Progress is progress

Author: JoshInnis

Makefile

@@ -26,6 +26,7 @@ OBJS = src/backend/postgraph.o \
        src/backend/access/ivfflat/ivfutils.o \
        src/backend/access/ivfflat/ivfvacuum.o \
        src/backend/access/vertex_heap/vertex_heapam_handler.o \
+       src/backend/access/vertex_heap/vertex_hash_search.o \
        src/backend/catalog/ag_catalog.o \
        src/backend/catalog/ag_graph.o \
        src/backend/catalog/ag_label.o \

regress/sql/vertex_am.sql

@@ -20,7 +20,7 @@ LOAD 'postgraph';
 
 
 
-CREATE TABLE vertex_am_tst (id postgraph.graphid not null, props postgraph.gtype not null) USING vertex;
+CREATE TABLE vertex_am_tst (id postgraph.graphid not null, props postgraph.gtype null) USING vertex;
 
 INSERT INTO vertex_am_tst (id, props)
 VALUES ('1'::postgraph.graphid, postgraph.gtype_build_map('id', 1));
@@ -41,4 +41,8 @@ UPDATE vertex_am_tst SET id = '2'::postgraph.graphid;
 INSERT INTO vertex_am_tst (id, props)
 VALUES ('4'::postgraph.graphid, postgraph.gtype_build_map('id', 1));
 
+
+INSERT INTO vertex_am_tst (id, props)
+VALUES ('5'::postgraph.graphid, NULL);
+
 SELECT * FROM vertex_am_tst;