Convert Type fields to use graph.Type

Add text encoding methods to replace string storage.

graph/iterator/all_iterator.go

@@ -81,7 +81,7 @@ func (it *Int64) TagResults(dst map[string]graph.Value) {
 func (it *Int64) Describe() graph.Description {
 	return graph.Description{
 		UID:  it.UID(),
-		Type: it.Type().String(),
+		Type: it.Type(),
 		Tags: it.tags.Tags(),
 	}
 }

graph/iterator/and_iterator.go

@@ -116,7 +116,7 @@ func (it *And) Describe() graph.Description {
 	primary := it.primaryIt.Describe()
 	return graph.Description{
 		UID:       it.UID(),
-		Type:      it.Type().String(),
+		Type:      it.Type(),
 		Tags:      it.tags.Tags(),
 		Iterator:  &primary,
 		Iterators: subIts,

graph/iterator/fixed_iterator.go

@@ -107,7 +107,7 @@ func (it *Fixed) Describe() graph.Description {
 	return graph.Description{
 		UID:  it.UID(),
 		Name: value,
-		Type: it.Type().String(),
+		Type: it.Type(),
 		Tags: fixed,
 		Size: int64(len(it.values)),
 	}

graph/iterator/hasa_iterator.go

@@ -131,7 +131,7 @@ func (it *HasA) Describe() graph.Description {
 	primary := it.primaryIt.Describe()
 	return graph.Description{
 		UID:       it.UID(),
-		Type:      it.Type().String(),
+		Type:      it.Type(),
 		Tags:      it.tags.Tags(),
 		Direction: it.dir,
 		Iterator:  &primary,

graph/iterator/iterator.go

@@ -80,7 +80,7 @@ func (it *Null) Optimize() (graph.Iterator, bool) { return it, false }
 func (it *Null) Describe() graph.Description {
 	return graph.Description{
 		UID:  it.UID(),
-		Type: it.Type().String(),
+		Type: it.Type(),
 	}
 }
 

graph/iterator/linksto_iterator.go

@@ -109,7 +109,7 @@ func (it *LinksTo) Describe() graph.Description {
 	primary := it.primaryIt.Describe()
 	return graph.Description{
 		UID:       it.UID(),
-		Type:      it.Type().String(),
+		Type:      it.Type(),
 		Direction: it.dir,
 		Iterator:  &primary,
 	}

graph/iterator/materialize_iterator.go

@@ -119,7 +119,7 @@ func (it *Materialize) Describe() graph.Description {
 	primary := it.subIt.Describe()
 	return graph.Description{
 		UID:      it.UID(),
-		Type:     it.Type().String(),
+		Type:     it.Type(),
 		Tags:     it.tags.Tags(),
 		Size:     int64(len(it.values)),
 		Iterator: &primary,

graph/iterator/optional_iterator.go

@@ -121,7 +121,7 @@ func (it *Optional) Describe() graph.Description {
 	primary := it.subIt.Describe()
 	return graph.Description{
 		UID:      it.UID(),
-		Type:     it.Type().String(),
+		Type:     it.Type(),
 		Tags:     it.tags.Tags(),
 		Iterator: &primary,
 	}

graph/iterator/or_iterator.go

@@ -117,7 +117,7 @@ func (it *Or) Describe() graph.Description {
 	}
 	return graph.Description{
 		UID:       it.UID(),
-		Type:      it.Type().String(),
+		Type:      it.Type(),
 		Tags:      it.tags.Tags(),
 		Iterators: subIts,
 	}

graph/iterator/value_comparison_iterator.go

@@ -192,7 +192,7 @@ func (it *Comparison) Describe() graph.Description {
 	primary := it.subIt.Describe()
 	return graph.Description{
 		UID:      it.UID(),
-		Type:     it.Type().String(),
+		Type:     it.Type(),
 		Iterator: &primary,
 	}
 }