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From jinfengni <...@git.apache.org>
Subject [GitHub] drill pull request: DRILL-4679: When convert() functions are prese...
Date Fri, 20 May 2016 15:55:41 GMT
Github user jinfengni commented on a diff in the pull request:

    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/project/ProjectRecordBatch.java
    @@ -136,6 +145,10 @@ public VectorContainer getOutgoingContainer() {
       protected IterOutcome doWork() {
    +    if (wasNone) {
    +      return IterOutcome.NONE;
    +    }
         int incomingRecordCount = incoming.getRecordCount();
         if (first && incomingRecordCount == 0) {
    --- End diff --
    The new logic will handle the case for Project's first outgoing batch. Not sure whether
Drill works properly after the first batch getting data and building the schema, but the next
incoming batch contains empty result. We may treat as a separate issue for further investigation.

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