prevent creating views with same name as existing table

go/libraries/doltcore/sqle/database.go

@@ -1101,7 +1101,19 @@ func (db Database) AllViews(ctx *sql.Context) ([]sql.ViewDefinition, error) {
 // it can exist in a sql session later. Returns sql.ErrExistingView if a view
 // with that name already exists.
 func (db Database) CreateView(ctx *sql.Context, name string, definition string) error {
-	err := sql.ErrExistingView.New(db.name, name)
+	ws, err := db.GetWorkingSet(ctx)
+	if err != nil {
+		return err
+	}
+	root := ws.WorkingRoot()
+
+	if exists, err := root.HasTable(ctx, name); err != nil {
+		return err
+	} else if exists {
+		return sql.ErrTableAlreadyExists.New(name)
+	}
+	err = sql.ErrExistingView.New(db.name, name)
+
 	return db.addFragToSchemasTable(ctx, "view", name, definition, time.Unix(0, 0).UTC(), err)
 }
 

integration-tests/bats/create-views.bats

@@ -21,6 +21,13 @@ SQL
     [[ "${lines[3]}" =~ ' 4 ' ]] || false
 }
 
+@test "create-views: create view with same name as table" {
+    dolt sql -q "create table t (i int)"
+    run dolt sql -q "create view t as select 1 from dual"
+    [ "$status" -eq 1 ]
+    [[ "$output" =~ 'already exists' ]] || false
+}
+
 @test "create-views: drop a single view" {
     run dolt sql <<SQL
 create view four as select 2+2 as res from dual;