Clarify why we need int constants for expression types.

Change-Id: I053fc5d32c118dbdb204dc8193337f981aff796e
10 years ago · 2ade9d40cf
parent 47551b8eee
commit 2ade9d40cf
1 changed files with 3 additions and 1 deletions
--- a/rules/ast/ast.go
+++ b/rules/ast/ast.go
@ -68,7 +68,9 @@ type groupedAggregation struct {
 // ExprType is an enum for the rule language expression types.
 type ExprType int

-// Possible language expression types.
+// Possible language expression types. We define these as integer constants
+// because sometimes we need to pass around just the type without an object of
+// that type.
 const (
 	SCALAR ExprType = iota
 	VECTOR