Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/906#discussion_r136439631
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/ScanBatch.java
---
@@ -329,9 +326,11 @@ public TypedFieldId getValueVectorId(SchemaPath path) {
@VisibleForTesting
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 #isNewSchema}).
+ * 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 --
Thanks for the explanation.
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