Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/716#discussion_r95046588
--- Diff: exec/java-exec/src/main/resources/drill-module.conf ---
@@ -167,10 +167,12 @@ drill.exec: {
debug: true,
janino_maxsize: 262144,
cache_max_size: 1000,
- // Enable to write generated source to disk. See ClassBuilder
- save_source: false,
// Where to save the generated source. See ClassBuilder
code_dir: "/tmp/drill/codegen"
--- End diff --
Writing to an external directory may require to add such source directory
to the IDE project each time when people try to debug the generated code.
One way I tried is to put the generated source under
$drill-java-exec/target/generated-sources, which is currently for freemarker's
generated source. That way, Intellij is able to load these new generated class
automatically when you debug.
The above approach requires us to exclude those runtime generated class
from the distribution jars, by adding the following in java-exec pom.xml.
```
<excludes>
<exclude>**/test/generated/**</exclude>
</excludes>
```
The above comment is optional.
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