CreateQuery async_insert_mt_test (children 3)
 Identifier async_insert_mt_test
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a (children 1)
    DataType UInt64
   ColumnDeclaration b (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType UInt64
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Identifier a
