CreateQuery xp (children 3)
 Identifier xp
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration i (children 1)
    DataType UInt64
   ColumnDeclaration j (children 1)
    DataType UInt64
 Storage definition (children 3)
  Function MergeTree
  Identifier i
  Set
