[GitHub] [calcite] kramerul commented on pull request #2441: [CALCITE-4655] Fix NullPointerExeption in JdbcTable.fieldClasses

[GitBox <gi...@apache.org>]

kramerul commented on pull request #2441:
URL: https://github.com/apache/calcite/pull/2441#issuecomment-864835346


   I tried to change it to the `Supplier` Pattern, but now I get
   
   ```
   [methodref.receiver.bound.invalid] Incompatible receiver type
       this.protoRowTypeSupplier = Suppliers.memoize(this::supplyProto);
                                                     ^
     found   : @UnderInitialization(org.apache.calcite.adapter.java.AbstractQueryableTable.class) @NonNull JdbcTable
     required: @Initialized @NonNull JdbcTable
     Consequence: method
       @UnderInitialization(org.apache.calcite.adapter.java.AbstractQueryableTable.class) @NonNull JdbcTable
     is not a valid method reference for
       @Initialized @NonNull RelProtoDataType supplyProto(@Initialized @NonNull JdbcTable this) in org.apache.calcite.adapter.jdbc.JdbcTable
   ```
   
   I don't know how to fix this.


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