CreateQuery x (children 3)
 Identifier x
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration i (children 1)
    DataType int
   ColumnDeclaration j (children 1)
    DataType int
 Storage definition (children 4)
  Function MergeTree
  Identifier i
  Identifier j
  Set