CreateQuery x (children 3)
 Identifier x
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a (children 1)
    DataType UInt64
   ColumnDeclaration sipHash64(a) (children 1)
    DataType UInt64
 Storage definition (children 2)
  Function MergeTree
  Identifier a
