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From dsbos <...@git.apache.org>
Subject [GitHub] drill pull request: DRILL-2288: Fix ScanBatch violation of IterOut...
Date Wed, 04 Nov 2015 21:22:48 GMT
Github user dsbos commented on a diff in the pull request:

    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/vector/complex/fn/JsonReader.java
    @@ -93,13 +93,15 @@ public void ensureAtLeastOneField(ComplexWriter writer) {
         if (!atLeastOneWrite) {
           // if we had no columns, create one empty one so we can return some data for count
           SchemaPath sp = columns.get(0);
    -      PathSegment root = sp.getRootSegment();
    +      PathSegment fieldPath = sp.getRootSegment();
           BaseWriter.MapWriter fieldWriter = writer.rootAsMap();
    -      while (root.getChild() != null && !root.getChild().isArray()) {
    -        fieldWriter = fieldWriter.map(root.getNameSegment().getPath());
    -        root = root.getChild();
    +      while (fieldPath.getChild() != null && ! fieldPath.getChild().isArray())
    +        fieldWriter = fieldWriter.map(fieldPath.getNameSegment().getPath());
    +        fieldPath = fieldPath.getChild();
    +      }
    +      if (fieldWriter.isEmptyMap()) {
    --- End diff --
    Sorry; I can't yet tell what you mean.
    (By "the ensureAtLeastOneField operations," did you mean operations _in_ ensureAtLeastOneField
(e.g., calling map(...) (in the loop)), the operation of calling ensureAtLeastOneField, or
something else? (The first seems to be needed to get to the right map, the second seems to
be needed to create a dummy column when one is actually needed.))

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