Issue 3 skip record level selection

[WaltonG]

Fixes #3

Changes proposed in this pull request:

• Skip the record level selection and display all rows and columns of the received data on the preview page.

[WaltonG]

@antoine2711 @wetneb This PR produces OutOfMemoryError when creating a project. At first it was caused by https://github.com/OpenRefine/SparqlExtension/blob/47121b2532a90e40c73d76bb12b04013074dc1ec/src/main/java/org/openrefine/extensions/sparql/utils/SPARQLQueryResultPreviewReader.java#L141

I changed the declaration to List<Object> rowOfCells = null; and added values to the list using rowOfCells = Collections.singletonList(jsonRows.get(index++)) This moved the cause to line and I applied the same solution

https://github.com/OpenRefine/SparqlExtension/blob/47121b2532a90e40c73d76bb12b04013074dc1ec/src/main/java/org/openrefine/extensions/sparql/utils/SPARQLQueryResultPreviewReader.java#L137

The cause was then moved to line https://github.com/OpenRefine/SparqlExtension/blob/47121b2532a90e40c73d76bb12b04013074dc1ec/src/main/java/org/openrefine/extensions/sparql/utils/SPARQLQueryResultPreviewReader.java#L162

I commented out the line and now the current error is Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "OkHttp TaskRunner" Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "pool-2-thread-2"

The code was succesfull in fetching the preview data and displaying it but on using the same code to create a project it results to OutOfMemoryError

[wetneb]

@antoine2711 can I leave this to you first? Ping me if you are stuck.

[antoine2711]

@antoine2711 can I leave this to you first? Ping me if you are stuck.

Sure. I was already looking into it.

Regards, Antoine

[WaltonG]

Just realised that in the database extension two classes that implement TableDataReader were used. One for the preview data and the other for the whole result set that creates the project. I will implement that and see the outcome

[antoine2711]

Just realised that in the database extension two classes that implement TableDataReader were used. One for the preview data and the other for the whole result set that creates the project. I will implement that and see the outcome

K. You might also have seen this:

java.lang.Error: Unresolved compilation problem: 
    SPARQLQueryResultPreviewReader cannot be resolved to a type

Regards, Antoine

[WaltonG]

The error still persists even after implementing create project TableDataReader in a separate java class. Using a small dataset of less that 50 rows gave me a false postive that the error is fixed.