CreateQuery summing_merge_tree (children 3)
 Identifier summing_merge_tree
 Columns definition (children 1)
  ExpressionList (children 5)
   ColumnDeclaration d (children 1)
    DataType Date
   ColumnDeclaration a (children 1)
    DataType String
   ColumnDeclaration x (children 1)
    DataType UInt32
   ColumnDeclaration y (children 1)
    DataType UInt64
   ColumnDeclaration z (children 1)
    DataType Float64
 Storage definition (children 1)
  Function SummingMergeTree (children 1)
   ExpressionList (children 3)
    Identifier d
    Identifier a
    Literal UInt64_8192