CreateQuery nested_test (children 3)
 Identifier nested_test
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration x (children 1)
    DataType UInt32
   ColumnDeclaration nest.col1 (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType String
   ColumnDeclaration nest.col2 (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType Int8
 Storage definition (children 2)
  Function MergeTree
  Identifier x
