remove alias from postgres $__timeGroup macro

docs/sources/features/datasources/postgres.md

@@ -60,7 +60,7 @@ Macro example | Description
 *$__timeFilter(dateColumn)* | Will be replaced by a time range filter using the specified column name. For example, *dateColumn BETWEEN '2017-04-21T05:01:17Z' AND '2017-04-21T05:06:17Z'*
 *$__timeFrom()* | Will be replaced by the start of the currently active time selection. For example, *'2017-04-21T05:01:17Z'*
 *$__timeTo()* | Will be replaced by the end of the currently active time selection. For example, *'2017-04-21T05:06:17Z'*
-*$__timeGroup(dateColumn,'5m')* | Will be replaced by an expression usable in GROUP BY clause. For example, *(extract(epoch from dateColumn)/300)::bigint*300 AS time*
+*$__timeGroup(dateColumn,'5m')* | Will be replaced by an expression usable in GROUP BY clause. For example, *(extract(epoch from dateColumn)/300)::bigint*300*
 *$__timeGroup(dateColumn,'5m', 0)* | Same as above but with a fill parameter so all null values will be converted to the fill value (all null values would be set to zero using this example).
 *$__unixEpochFilter(dateColumn)* | Will be replaced by a time range filter using the specified column name with times represented as unix timestamp. For example, *dateColumn >= 1494410783 AND dateColumn <= 1494497183*
 *$__unixEpochFrom()* | Will be replaced by the start of the currently active time selection as unix timestamp. For example, *1494410783*

pkg/tsdb/postgres/macros.go

@@ -109,7 +109,7 @@ func (m *postgresMacroEngine) evaluateMacro(name string, args []string) (string,
 				m.query.Model.Set("fillValue", floatVal)
 			}
 		}
-		return fmt.Sprintf("floor(extract(epoch from %s)/%v)*%v AS time", args[0], interval.Seconds(), interval.Seconds()), nil
+		return fmt.Sprintf("floor(extract(epoch from %s)/%v)*%v", args[0], interval.Seconds(), interval.Seconds()), nil
 	case "__unixEpochFilter":
 		if len(args) == 0 {
 			return "", fmt.Errorf("missing time column argument for macro %v", name)

pkg/tsdb/postgres/macros_test.go

@@ -53,7 +53,7 @@ func TestMacroEngine(t *testing.T) {
 				sql, err := engine.Interpolate(query, timeRange, "GROUP BY $__timeGroup(time_column,'5m')")
 				So(err, ShouldBeNil)
 
-				So(sql, ShouldEqual, "GROUP BY floor(extract(epoch from time_column)/300)*300 AS time")
+				So(sql, ShouldEqual, "GROUP BY floor(extract(epoch from time_column)/300)*300")
 			})
 
 			Convey("interpolate __timeGroup function with spaces between args", func() {
@@ -61,7 +61,7 @@ func TestMacroEngine(t *testing.T) {
 				sql, err := engine.Interpolate(query, timeRange, "GROUP BY $__timeGroup(time_column , '5m')")
 				So(err, ShouldBeNil)
 
-				So(sql, ShouldEqual, "GROUP BY floor(extract(epoch from time_column)/300)*300 AS time")
+				So(sql, ShouldEqual, "GROUP BY floor(extract(epoch from time_column)/300)*300")
 			})
 
 			Convey("interpolate __timeTo function", func() {

pkg/tsdb/postgres/postgres_test.go

@@ -183,7 +183,7 @@ func TestPostgres(t *testing.T) {
 					Queries: []*tsdb.Query{
 						{
 							Model: simplejson.NewFromAny(map[string]interface{}{
-								"rawSql": "SELECT $__timeGroup(time, '5m'), avg(value) as value FROM metric GROUP BY 1 ORDER BY 1",
+								"rawSql": "SELECT $__timeGroup(time, '5m') AS time, avg(value) as value FROM metric GROUP BY 1 ORDER BY 1",
 								"format": "time_series",
 							}),
 							RefId: "A",
@@ -227,7 +227,7 @@ func TestPostgres(t *testing.T) {
 					Queries: []*tsdb.Query{
 						{
 							Model: simplejson.NewFromAny(map[string]interface{}{
-								"rawSql": "SELECT $__timeGroup(time, '5m', NULL), avg(value) as value FROM metric GROUP BY 1 ORDER BY 1",
+								"rawSql": "SELECT $__timeGroup(time, '5m', NULL) AS time, avg(value) as value FROM metric GROUP BY 1 ORDER BY 1",
 								"format": "time_series",
 							}),
 							RefId: "A",
@@ -281,7 +281,7 @@ func TestPostgres(t *testing.T) {
 					Queries: []*tsdb.Query{
 						{
 							Model: simplejson.NewFromAny(map[string]interface{}{
-								"rawSql": "SELECT $__timeGroup(time, '5m', 1.5), avg(value) as value FROM metric GROUP BY 1 ORDER BY 1",
+								"rawSql": "SELECT $__timeGroup(time, '5m', 1.5) AS time, avg(value) as value FROM metric GROUP BY 1 ORDER BY 1",
 								"format": "time_series",
 							}),
 							RefId: "A",

public/app/plugins/datasource/postgres/partials/query.editor.html

@@ -53,7 +53,7 @@ Macros:
 - $__timeEpoch -> extract(epoch from column) as "time"
 - $__timeFilter(column) -> column BETWEEN '2017-04-21T05:01:17Z' AND '2017-04-21T05:01:17Z'
 - $__unixEpochFilter(column) ->  column >= 1492750877 AND column <= 1492750877
-- $__timeGroup(column,'5m') -> (extract(epoch from column)/300)::bigint*300 AS time
+- $__timeGroup(column,'5m') -> (extract(epoch from column)/300)::bigint*300
 
 Example of group by and order by with $__timeGroup:
 SELECT