Github user jacques-n commented on a diff in the pull request:
https://github.com/apache/drill/pull/207#discussion_r43472371
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/flatten/FlattenRecordBatch.java
---
@@ -288,7 +288,7 @@ protected boolean setupNewSchema() throws
SchemaChangeException {
final IntOpenHashSet transferFieldIds = new IntOpenHashSet();
final NamedExpression flattenExpr = new
NamedExpression(popConfig.getColumn(), new
FieldReference(popConfig.getColumn()));
- final ValueVectorReadExpression vectorRead =
(ValueVectorReadExpression)ExpressionTreeMaterializer.materialize(flattenExpr.getExpr(),
incoming, collector, context.getFunctionRegistry(), true);
+ final ValueVectorReadExpression vectorRead =
(ValueVectorReadExpression)ExpressionTreeMaterializer.materialize(flattenExpr.getExpr(),
incoming, collector, context.getFunctionRegistry(), true, false);
--- End diff --
Can you just update materialize to have a version that doesn't take
unionTypeEnabled and then uses false as the input. That way we don't need to
change all the expressions (and then change them back once union type is always
enabled).
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