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From jinfengni <...@git.apache.org>
Subject [GitHub] drill pull request #906: DRILL-5546: Handle schema change exception failure ...
Date Tue, 29 Aug 2017 07:15:01 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/ScanBatch.java
    @@ -329,9 +326,11 @@ public TypedFieldId getValueVectorId(SchemaPath path) {
       public static class Mutator implements OutputMutator {
    -    /** Whether schema has changed since last inquiry (via #isNewSchema}).  Is
    -     *  true before first inquiry. */
    -    private boolean schemaChanged = true;
    +    /** Flag keeping track whether top-level schema has changed since last inquiry (via
    +     * It's initialized to false, or reset to false after #isNewSchema or after #clear,
until a new value vector
    +     * or a value vector with different type is added to fieldVectorMap.
    +     **/
    +    private boolean schemaChanged;
    --- End diff --
    No comments with respect to "flag vs counter". But the flag is in the existing code, and
the patch I have simply 1) change the initial value of flag, 2) add comments. 

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