CreateQuery test_parallel_index (children 3)
 Identifier test_parallel_index
 Columns definition (children 2)
  ExpressionList (children 1)
   ColumnDeclaration z (children 1)
    DataType UInt64
  ExpressionList (children 1)
   Index (children 2)
    Identifier z
    Function set (children 1)
     ExpressionList (children 1)
      Literal UInt64_8
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
