Github user jacques-n commented on a diff in the pull request: https://github.com/apache/drill/pull/228#discussion_r43717313 --- 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 purposes. 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 -- The change I was focused on was the addition of the fieldWriter.isEmptyMap() condition. Why was this condition added to the code?
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