Conditional Upsert not work

[cxcel]

with git main branch(8ff4e72) code and dgraph verion 23.1.0.
Conditional Upsert not work

data := []map[string]interface{}{
{
"uid": "uid(v)",
"email": "[email protected]",
"name": "first name"
},
}

userByEmailQuery := dqlx.Query(dqlx.EqFn("email", "[email protected]")).
.Select(v as uid name)

condition := dqlx.Condition(dqlx.Eq("len(v)", "1"))

resp, err := db.Mutation().
Query(userByEmailQuery).
Condition(condition).
Set(data).
Execute(ctx)

but i user dgo api, it works

query = `

query {
user as var(func: eq(email, "[email protected]"))
}mu := &api.Mutation{ Cond: @if(eq(len(user), 1)), // Only mutate if "[email protected]" belongs to single user. SetNquads: []byte(uid(user) "first name" .`),
}
req := &api.Request{
Query: query,
Mutations: []*api.Mutation{mu},
CommitNow: true,
}

// Update email only if exactly one matching uid is found.
_, err = dg.NewTxn().Do(ctx, req)

This solves it, I don't know if it will introduce other problems

diff --git a/predicate.go b/predicate.go
index 96cd546..97c9031 100644
--- a/predicate.go
+++ b/predicate.go
@@ -221,22 +221,22 @@ func EscapePredicate(field string) string {
predicate, alias, directive = parsePredicate(predicate)

            if alias != "" {

•                   alias = fmt.Sprintf("<%s>:", alias)
  

•                   alias = fmt.Sprintf("%s:", alias)
            }
  

•           return fmt.Sprintf("%s %s %s<%s>%s", varName, asKeyword, alias, predicate, directive)
  

•           return fmt.Sprintf("%s %s %s%s%s", varName, asKeyword, alias, predicate, directive)
    }
  
    field, alias, directive = parsePredicate(field)
  
    if alias != "" {
  

•           alias = fmt.Sprintf("<%s>:", alias)
  

•           alias = fmt.Sprintf("%s:", alias)
    }
  
    if strings.HasPrefix(field, "expand(") {
            return fmt.Sprintf("%s%s%s", alias, field, directive)
    }
  

•   return fmt.Sprintf("%s<%s>%s", alias, field, directive)
  

•   return fmt.Sprintf("%s%s%s", alias, field, directive)
  

}