SQL Expressions: Query Service Support (#101955)

---------

Co-authored-by: Adam Simpson <adam@adamsimpson.net>
Co-authored-by: Sarah Zinger <sarah.zinger@grafana.com>

pkg/expr/reader.go

@@ -126,9 +126,8 @@ func (h *ExpressionQueryReader) ReadQuery(
 		}
 
 	case QueryTypeSQL:
-		enabled := enableSqlExpressions(h)
-		if !enabled {
-			return eq, fmt.Errorf("sqlExpressions is not implemented")
+		if !h.features.IsEnabledGlobally(featuremgmt.FlagSqlExpressions) {
+			return eq, fmt.Errorf("sql expressions are disabled")
 		}
 		q := &SQLExpression{}
 		err = iter.ReadVal(q)
@@ -192,11 +191,3 @@ func getReferenceVar(exp string, refId string) (string, error) {
 	}
 	return exp, nil
 }
-
-func enableSqlExpressions(h *ExpressionQueryReader) bool {
-	enabled := !h.features.IsEnabledGlobally(featuremgmt.FlagSqlExpressions)
-	if enabled {
-		return false
-	}
-	return false
-}