CreateQuery a (children 3)
 Identifier a
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration k (children 1)
    DataType UInt64
   ColumnDeclaration a1 (children 1)
    DataType UInt64
   ColumnDeclaration a2 (children 1)
    DataType String
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
