CreateQuery 02702_logical_optimizer_with_null_column (children 3)
 Identifier 02702_logical_optimizer_with_null_column
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Int32
   ColumnDeclaration b (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
 Storage definition (children 1)
  Function Memory
