CreateQuery my_table (children 3)
 Identifier my_table
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration Id (children 1)
    DataType UInt32
   ColumnDeclaration Object (children 1)
    DataType Nested (children 1)
     ExpressionList (children 2)
      NameTypePair Key (children 1)
       DataType UInt8
      NameTypePair Value (children 1)
       DataType String
 Storage definition (children 2)
  Function MergeTree
  Identifier Id
