Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1658
I think this PR is ready to be reviewed.
While this PR includes quite a lot of changes i'm highlighting some key
changes.
1. Display multiple types of output in a single paragraph.
Previously, if output includes multiple display system directive (e.g.
%html, %text, etc) only the last one was effective and all the previous output
was ignored. After the change, a paragraph sequentially display all display
system directive in the output result.
To do that, on the front-end side,
Created ResultCtrl controller under
`zeppelin-web/src/app/notebook/paragraph/result`
and moved paragraph result rendering related scripts/templates under
this directory.
/notebook/paragraph/paragraph-graph.html ->
/notebook/paragraph/result/result-graph.html
/notebook/paragraph/paragraph-pivot.html ->
/notebook/paragraph/result/result-pivot.html
/notebook/paragraph/paragraph-result.html ->
/notebook/paragraph/result/result-results.html
/notebook/paragraph/paragraph-chart-selector.html ->
/notebook/paragraph/result/result-chart-selector.html
on the back-end side,
Created
`zeppelin-interpreter/interpreter/InterpreterResultMessageOutput.java` to take
care of single output stream and existing
`zeppelin-interpreter/interpreter/InterpreterResultMessageOutput.java` changed
to take care of multiple outputs through `InterpreterResultMessageOutput`
2. Compatibility between old, new notebook format.
note.json format is changed to store multiple outputs in the paragraph.
To read note.json created by previous versions of Zeppelin,
[Notebook.convertFromSingleResultToMultipleResultsFormat()](https://github.com/apache/zeppelin/blob/7ab6679a87ed75f176ffa61d8cf6c73f4241c528/zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/Notebook.java#L385)
will automatically convert format when note.json is loaded in Zeppelin.
If old version of Zeppelin reads notebook created by newer version,
everything will be load normally except for output. Output will be empty.
In detail, note.json is changed from
```
paragraph : [
{
result : {
code: "",
type: "",
msg: ""
},
config : {
graph : {},
...
},
...
},
...
],
...
```
to
```
paragraph : [
{
results : {
{
code: "",
msg: [
{
type: "",
data: ""
},
{
type: "",
data: ""
},
...
]
},
config : {
results : [
{
graph : {},
},
{
graph : {},
},
...
]
},
...
},
...
],
...
```
3. Every other changes are trivial
Most changes are trivial change due to change of InterpreterOutput and
InterpreterResult api changes.
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