extending test to cover renames

bats/sql_diff.bats

@@ -347,10 +347,10 @@ teardown() {
     dolt add .
     dolt commit -m "dropped column"
 
-    # confirm a difference exists
+    # confirm RENAME statement is being used
     run dolt diff --sql newbranch firstbranch
     [ "$status" -eq 0 ]
-    [[ "$output" != "" ]] || false
+    [[ "$output" = "RENAME TABLE 'test' TO 'newname'" ]] || false
 
     dolt diff --sql newbranch firstbranch > query
     dolt checkout firstbranch

go/libraries/doltcore/diff/table_diff.go

@@ -33,6 +33,13 @@ func SQLTableDIffs(ctx context.Context, r1, r2 *doltdb.RootValue) error {
 		return err
 	}
 
+	renames := make(map[string]string)
+	//rename tables
+	for k, v := range renames {
+		println(k, v)
+		cli.Println("RENAME TABLE",sql.QuoteIdentifier(k),"TO",sql.QuoteIdentifier(v))
+	}
+
 	// drop tables
 	for _, tblName := range drops {
 		cli.Println("DROP TABLE", sql.QuoteIdentifier(tblName), ";")