feat: support nested array schema

internal/xsql/parser.go

@@ -1455,6 +1455,20 @@
 					return nil, fmt.Errorf("found %q, expect rparen in struct of array type definition.", lit2)
 				}
 			}
+		} else if t == ast.ARRAY {
+			if f, err := p.parseStreamArrayType(); err != nil {
+				return nil, err
+			} else {
+				if tok2, lit2 := p.scanIgnoreWhitespace(); tok2 == ast.RPAREN {
+					lStack.Pop()
+					if lStack.Len() > 0 {
+						return nil, fmt.Errorf("Parenthesis is in array of array type %q not matched.", tok1)
+					}
+					return &ast.ArrayType{Type: ast.ARRAY, FieldType: f}, nil
+				} else {
+					return nil, fmt.Errorf("found %q, expect rparen in array of array type definition.", lit2)
+				}
+			}
 		} else if tok1 == ast.COMMA {
 			p.unscan()
 		} else {

internal/xsql/parser_stream_test.go

@@ -30,6 +30,25 @@ func TestParser_ParseCreateStream(t *testing.T) {
 		stmt *ast.StreamStmt
 		err  string
 	}{
+		{
+			s: `CREATE STREAM demo(list ARRAY(ARRAY(BIGINT))) WITH (DATASOURCE="users", FORMAT="JSON")`,
+			stmt: &ast.StreamStmt{
+				Name: ast.StreamName("demo"),
+				StreamFields: []ast.StreamField{
+					{
+						Name: "list",
+						FieldType: &ast.ArrayType{
+							Type:      ast.ARRAY,
+							FieldType: &ast.ArrayType{Type: ast.BIGINT},
+						},
+					},
+				},
+				Options: &ast.Options{
+					DATASOURCE: "users",
+					FORMAT:     "JSON",
+				},
+			},
+		},
 		{
 			s: `CREATE STREAM demo (
 					USERID BIGINT,
@@ -67,7 +86,6 @@ func TestParser_ParseCreateStream(t *testing.T) {
 				},
 			},
 		},
-
 		{
 			s: `CREATE STREAM demo (
 					USERID BIGINT,
@@ -86,7 +104,6 @@ func TestParser_ParseCreateStream(t *testing.T) {
 				},
 			},
 		},
-
 		{
 			s: `CREATE STREAM demo (
 					ADDRESSES ARRAY(STRUCT(STREET_NAME STRING, NUMBER BIGINT)),