CreateQuery n1_n2_join (children 3)
 Identifier n1_n2_join
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration k (children 1)
    DataType UInt64
   ColumnDeclaration v1 (children 1)
    DataType String
   ColumnDeclaration v2 (children 1)
    DataType Int64
 Storage definition (children 2)
  Function MergeTree
  Identifier k
