CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration x (children 1)
    DataType Tuple (children 1)
     ExpressionList (children 2)
      DataType String
      DataType Array (children 1)
       ExpressionList (children 1)
        DataType Map (children 1)
         ExpressionList (children 2)
          DataType String
          DataType Variant (children 1)
           ExpressionList (children 2)
            DataType LowCardinality (children 1)
             ExpressionList (children 1)
              DataType UInt64
            DataType String
 Storage definition (children 1)
  Function Memory
