Update PATH token types

Remove unused PATH token and move EDGE tokens to literals.

sql/token.go

@@ -31,7 +31,6 @@ const (
 
 	DATE     // 1970-01-01
 	TIME     // 1970-01-01T00:00:00+00:00
-	PATH     // person->like->person
 	JSON     // {"test":true}
 	IDENT    // something
 	THING    // @class:id
@@ -44,6 +43,10 @@ const (
 	DURATION // 13h
 	PARAM    // $1
 
+	OEDGE // ->
+	IEDGE // <-
+	BEDGE // <->
+
 	DOT       // .
 	COMMA     // ,
 	QMARK     // ?
@@ -82,10 +85,6 @@ const (
 	INS // ∈
 	NIS // ∉
 
-	OEDGE // ->
-	IEDGE // <-
-	BEDGE // <->
-
 	operatorEnd
 
 	// literals
@@ -204,7 +203,6 @@ var tokens = [...]string{
 
 	DATE:     "DATE",
 	TIME:     "TIME",
-	PATH:     "PATH",
 	JSON:     "JSON",
 	IDENT:    "IDENT",
 	THING:    "THING",
@@ -217,6 +215,10 @@ var tokens = [...]string{
 	DURATION: "DURATION",
 	PARAM:    "PARAM",
 
+	OEDGE: "->",
+	IEDGE: "<-",
+	BEDGE: "<->",
+
 	DOT:       ".",
 	COMMA:     ",",
 	QMARK:     "?",
@@ -251,10 +253,6 @@ var tokens = [...]string{
 	INS: "∈",
 	NIS: "∉",
 
-	OEDGE: "->",
-	IEDGE: "<-",
-	BEDGE: "<->",
-
 	// keywords
 
 	ACCEPT:          "ACCEPT",