CreateQuery merge_tree (children 3)
 Identifier merge_tree
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration x (children 1)
    DataType UInt64
   ColumnDeclaration date (children 1)
    DataType Date
 Storage definition (children 1)
  Function MergeTree (children 1)
   ExpressionList (children 3)
    Identifier date
    Identifier x
    Literal UInt64_1