From 365072013d5dbe589759a1e2e5c71490d57f4d37 Mon Sep 17 00:00:00 2001
From: kun <oiooj@qq.com>
Date: Fri, 8 May 2020 15:57:25 +0800
Subject: [PATCH] feat: add CleanGroupByIntervalCache API

After called GroupByInterval function, if we update the `time` in
Dimensions, we still got the cached interval.
---
 ast.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ast.go b/ast.go
index 140a42c..403c131 100644
--- a/ast.go
+++ b/ast.go
@@ -1859,6 +1859,11 @@ func (s *SelectStatement) HasDimensionWildcard() bool {
 	return false
 }
 
+// CleanGroupByIntervalCache cleans the cached time interval.
+func (s *SelectStatement) CleanGroupByIntervalCache() {
+	s.groupByInterval = 0
+}
+
 // GroupByInterval extracts the time interval, if specified.
 func (s *SelectStatement) GroupByInterval() (time.Duration, error) {
 	// return if we've already pulled it out