CreateQuery optimize_lazy_materialization_with_fixed_string_data_type (children 3)
 Identifier optimize_lazy_materialization_with_fixed_string_data_type
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration a (children 1)
    DataType UInt64
   ColumnDeclaration b (children 1)
    DataType UInt64
   ColumnDeclaration c (children 1)
    DataType FixedString (children 1)
     ExpressionList (children 1)
      Literal UInt64_10
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Identifier a
