CreateQuery summing_merge_tree_datetime64 (children 3)
 Identifier summing_merge_tree_datetime64
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration pk (children 1)
    DataType UInt64
   ColumnDeclaration timestamp (children 1)
    DataType DateTime64 (children 1)
     ExpressionList (children 1)
      Literal UInt64_3
   ColumnDeclaration value (children 1)
    DataType UInt64
 Storage definition (children 2)
  Function SummingMergeTree (children 1)
   ExpressionList
  Identifier pk
