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Slow blob fetch into java procedure #4

@AlexBekhtin

Description

@AlexBekhtin

in DB:

create or alter procedure java_split (
  dummy blob SUB_TYPE TEXT,
  delimiter varchar(10)
) returns (item varchar(60))
  external name 'org.firebirdsql.fbjava.examples.fbjava_example.FbSplit.split()'
  engine java;

Java:

public class FbSplit {
    public static ExternalResultSet split() throws Exception {
        final ProcedureContext context = ProcedureContext.get();
        return new ExternalResultSet() {
            ValuesMetadata outMetadata = context.getOutputMetadata();
            Values outValues = context.getOutputValues();
            Values inputValues = context.getInputValues();

            String[] items_list = null;
            int item_index;

            @Override
            public boolean fetch() throws Exception {
                if (items_list == null) {
                    java.lang.Object blob_object = inputValues.getObject(1);

//                    FBBlob blob = (FBBlob) blob_object;
                    java.sql.Blob blob = (java.sql.Blob) blob_object;

                    byte[] bytes_data = blob.getBytes(1, (int) (blob.length())); // TO SLOW
                    String blob_string = new String(bytes_data);
                    items_list = blob_string.split(inputValues.getObject(2).toString());
                }
                if (item_index < items_list.length) {
                    outValues.setObject(1, items_list[item_index]);

                    item_index++;
                    return true;
                }
                return false;

            }
        };
    }
}

then call

select * from java_split(6 000 000 characters length blob, ',')

40 sec execution time
but if I call from standalone java application ~1-2 sec

env:
java 8
jaybird 2.2.10

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