rizaon opened a new pull request #1025:
URL: https://github.com/apache/orc/pull/1025
### What changes were proposed in this pull request?
This patch add support to convert json to UNION type in orc file. For
example, for schema `struct<foo:uniontype<int,string>>`, the following
json lines can be parsed into UNION type.
```
{"foo": {"tag": 0, "value": 1}}
{"foo": {"tag": 1, "value": "testing"}}
{"foo": {"tag": 0, "value": 3}}
```
### Why are the changes needed?
This add a missing support for UNION type in java convert tool.
### How was this patch tested?
Manually test against handcrafted json file.
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