CreateQuery truncate_test_merge_tree (children 3)
 Identifier truncate_test_merge_tree
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration p (children 1)
    DataType Date
   ColumnDeclaration k (children 1)
    DataType UInt64
 Storage definition (children 2)
  Function MergeTree
  Identifier p