From 165ce036f48c3be3445feb77f7fbcc95994053e9 Mon Sep 17 00:00:00 2001
From: frenchzed <frenchzed@gmail.com>
Date: Fri, 28 Apr 2023 09:05:41 -0400
Subject: [PATCH] handle empty measurements

---
 ast.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ast.go b/ast.go
index caa324f..6d661fb 100644
--- a/ast.go
+++ b/ast.go
@@ -3475,7 +3475,11 @@ func (m *Measurement) String() string {
 		_, _ = buf.WriteString(m.Regex.String())
 	}
 
-	return buf.String()
+	if buf.Len() == 0 {
+		return QuoteIdent("")
+	} else {
+		return buf.String()
+	}
 }
 
 // SubQuery is a source with a SelectStatement as the backing store.