Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/508#discussion_r64677344
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectPrel.java
---
@@ -81,6 +83,18 @@ public SelectionVectorMode getEncoding() {
@Override
public boolean needsFinalColumnReordering() {
+ for (RexNode expr : this.exps) {
+ if (expr.getKind() == SqlKind.OTHER_FUNCTION &&
+ expr instanceof RexCall &&
+ ((RexCall)
expr).getOperator().getName().equalsIgnoreCase("CONVERT_FROMJSON")) {
--- End diff --
Can you pls add a comment that convert_fromjson() currently can only used
as a top level function (it can not be nested in other function)? Otherwise, we
have to walk through the expression tree to check the existence of this
function.
Tried with convert_to(convert_from(t.jsonstr, 'json'), 'json'), and it hit
NPE in execution.
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