CreateQuery group_by_pk (children 3)
 Identifier group_by_pk
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration k (children 1)
    DataType UInt64
   ColumnDeclaration v (children 1)
    DataType UInt64
 Storage definition (children 3)
  Function MergeTree
  Function modulo (children 1)
   ExpressionList (children 2)
    Identifier v
    Literal UInt64_50
  Identifier k
