CreateQuery table_map (children 3)
 Identifier table_map
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a (children 1)
    DataType Map (children 1)
     ExpressionList (children 2)
      DataType UInt8
      DataType UInt64
   ColumnDeclaration b (children 1)
    DataType UInt8
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Identifier b
  Set
