Github user Serhii-Harnyk commented on a diff in the pull request:
https://github.com/apache/drill/pull/580#discussion_r98232198
--- 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 --
@paul-rogers, map fields have data mode required and they are the part of
the schema, that's why there are no difference between missing field in some
record, and the field that exists but empty.
This fix for your example will return result
`{"a":{"b":10},"c":[1,2,3]}`
`{"c":[4]}`
`{"b":[5]}`
`{"a":{"b":20}}`
`{"a":{"b":20}}`
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