fixup! Simple support for de-duplicating tuple values.

Signed-off-by: Arthur Schreiber <[email protected]>

Author: arthurschreiber

go/vt/vtgate/executor_select_test.go

@@ -3337,29 +3337,25 @@ func TestSelectWithUnionAll(t *testing.T) {
 		BindVariables: map[string]*querypb.BindVariable{
 			"__vals": bv1,
 			"vtg1":   bv,
-			"vtg2":   bv,
 		},
 	}, {
 		Sql: "select id from `user` where id in ::__vals",
 		BindVariables: map[string]*querypb.BindVariable{
 			"__vals": bv1,
 			"vtg1":   bv,
-			"vtg2":   bv,
 		},
 	}}
 	sbc2WantQueries := []*querypb.BoundQuery{{
 		Sql: "select id from `user` where id in ::__vals",
 		BindVariables: map[string]*querypb.BindVariable{
 			"__vals": bv2,
 			"vtg1":   bv,
-			"vtg2":   bv,
 		},
 	}, {
 		Sql: "select id from `user` where id in ::__vals",
 		BindVariables: map[string]*querypb.BindVariable{
 			"__vals": bv2,
 			"vtg1":   bv,
-			"vtg2":   bv,
 		},
 	}}
 	session := &vtgatepb.Session{