Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/580#discussion_r99970247
--- Diff:
exec/vector/src/main/java/org/apache/drill/exec/vector/complex/MapVector.java
---
@@ -317,6 +317,12 @@ public Object getObject(int index) {
if (v != null && index < v.getAccessor().getValueCount()) {
Object value = v.getAccessor().getObject(index);
if (value != null) {
+ if ((v.getAccessor().getObject(index) instanceof Map
+ && ((Map) v.getAccessor().getObject(index)).size() ==
0)
+ || (v.getAccessor().getObject(index) instanceof List
+ && ((List) v.getAccessor().getObject(index)).size() ==
0)) {
+ continue;
+ }
--- End diff --
See the JIRA entry for more comments. The key problem is that Drill does
not support standard JSON rules. So, we are simply moving the problem around.
Consider this case:
{code}
{ }
{ "a": { } }
{ "a": { "b": {} } }
{code}
It appears that the code here would emit:
{ }
{ }
{ "a": { } }
{code}
If we are going to apply the empty-is-not-present rule we should do so
recursively.
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