CreateQuery test_group_by (children 3)
 Identifier test_group_by
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration id (children 1)
    DataType UInt32
   ColumnDeclaration category (children 1)
    DataType String
   ColumnDeclaration value (children 1)
    DataType UInt32
 Storage definition (children 1)
  Function Memory
