CreateQuery optimize_lazy_materialization_with_variant_data_type (children 3)
 Identifier optimize_lazy_materialization_with_variant_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 Variant (children 1)
     ExpressionList (children 3)
      DataType UInt64
      DataType String
      DataType Array (children 1)
       ExpressionList (children 1)
        DataType UInt64
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Identifier a
