ASF GitHub Bot commented on DRILL-5657:

Github user bitblender commented on a diff in the pull request:

    --- Diff: 
    @@ -0,0 +1,412 @@
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    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
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    +package org.apache.drill.exec.physical.rowSet.impl;
    +import java.util.Collection;
    +import org.apache.drill.common.exceptions.UserException;
    +import org.apache.drill.exec.memory.BufferAllocator;
    +import org.apache.drill.exec.physical.rowSet.ResultSetLoader;
    +import org.apache.drill.exec.physical.rowSet.TupleLoader;
    +import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
    +import org.apache.drill.exec.record.VectorContainer;
    +import org.apache.drill.exec.vector.ValueVector;
    + * Implementation of the result set loader.
    + * @see {@link ResultSetLoader}
    + */
    +public class ResultSetLoaderImpl implements ResultSetLoader, 
WriterIndexImpl.WriterIndexListener {
    +  public static class ResultSetOptions {
    +    public final int vectorSizeLimit;
    +    public final int rowCountLimit;
    +    public final boolean caseSensitive;
    +    public final ResultVectorCache inventory;
    --- End diff --
    The name 'inventory' does not convey the intent clearly.

> Implement size-aware result set loader
> --------------------------------------
>                 Key: DRILL-5657
>                 URL: https://issues.apache.org/jira/browse/DRILL-5657
>             Project: Apache Drill
>          Issue Type: Improvement
>    Affects Versions: Future
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>             Fix For: Future
> A recent extension to Drill's set of test tools created a "row set" 
> abstraction to allow us to create, and verify, record batches with very few 
> lines of code. Part of this work involved creating a set of "column 
> accessors" in the vector subsystem. Column readers provide a uniform API to 
> obtain data from columns (vectors), while column writers provide a uniform 
> writing interface.
> DRILL-5211 discusses a set of changes to limit value vectors to 16 MB in size 
> (to avoid memory fragmentation due to Drill's two memory allocators.) The 
> column accessors have proven to be so useful that they will be the basis for 
> the new, size-aware writers used by Drill's record readers.
> A step in that direction is to retrofit the column writers to use the 
> size-aware {{setScalar()}} and {{setArray()}} methods introduced in 
> DRILL-5517.
> Since the test framework row set classes are (at present) the only consumer 
> of the accessors, those classes must also be updated with the changes.
> This then allows us to add a new "row mutator" class that handles size-aware 
> vector writing, including the case in which a vector fills in the middle of a 
> row.

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