From 50d252566e04260e35549703ca08be87319bc8f4 Mon Sep 17 00:00:00 2001
From: "Jonathan A. Sternberg" <jonathan@influxdb.com>
Date: Tue, 1 Nov 2016 15:54:43 -0500
Subject: [PATCH] Support the ON syntax in SHOW TAG VALUES

The parser was updated previously in #7295 and the functionality was
supposed to be there, but the wiring in the query engine for that to
happen was never written.
---
 coordinator/statement_executor.go | 8 ++++++--
 influxql/statement_rewriter.go    | 1 +
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/coordinator/statement_executor.go b/coordinator/statement_executor.go
index 2bc334384a4..c4bc21cb440 100644
--- a/coordinator/statement_executor.go
+++ b/coordinator/statement_executor.go
@@ -857,11 +857,11 @@ func (e *StatementExecutor) executeShowSubscriptionsStatement(stmt *influxql.Sho
 }
 
 func (e *StatementExecutor) executeShowTagValues(q *influxql.ShowTagValuesStatement, ctx *influxql.ExecutionContext) error {
-	if ctx.Database == "" {
+	if q.Database == "" {
 		return ErrDatabaseNameRequired
 	}
 
-	tagValues, err := e.TSDBStore.TagValues(ctx.Database, q.Condition)
+	tagValues, err := e.TSDBStore.TagValues(q.Database, q.Condition)
 	if err != nil {
 		ctx.Results <- &influxql.Result{
 			StatementID: ctx.StatementID,
@@ -1089,6 +1089,10 @@ func (e *StatementExecutor) NormalizeStatement(stmt influxql.Statement, defaultD
 			if node.Database == "" {
 				node.Database = defaultDatabase
 			}
+		case *influxql.ShowTagValuesStatement:
+			if node.Database == "" {
+				node.Database = defaultDatabase
+			}
 		case *influxql.Measurement:
 			switch stmt.(type) {
 			case *influxql.DropSeriesStatement, *influxql.DeleteSeriesStatement:
diff --git a/influxql/statement_rewriter.go b/influxql/statement_rewriter.go
index 3ca717b4dd1..ef2f6c39030 100644
--- a/influxql/statement_rewriter.go
+++ b/influxql/statement_rewriter.go
@@ -122,6 +122,7 @@ func rewriteShowTagValuesStatement(stmt *ShowTagValuesStatement) (Statement, err
 	condition = rewriteSourcesCondition(stmt.Sources, condition)
 
 	return &ShowTagValuesStatement{
+		Database:   stmt.Database,
 		Op:         stmt.Op,
 		TagKeyExpr: stmt.TagKeyExpr,
 		Condition:  condition,