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