CreateQuery mem3 (children 3)
 Identifier mem3
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration key (children 1)
    DataType Int
   ColumnDeclaration _shard_num (children 1)
    DataType String
 Storage definition (children 1)
  Function Memory (children 1)
   ExpressionList