/**
* Annotate the used and ignored columns in the job parameter JSON For both the used and the
* ignored columns, the following rules apply: If the number of columns is less or equal than
* 100, a dense list of used columns is reported. If the number of columns is greater than 100,
* the number of columns is reported. If the number of columns is 0, a "N/A" is reported.
*
* @return JsonObject annotated with used/ignored columns
*/
@Override
public JsonObject toJSON() {
JsonObject jo = super.toJSON();
if (!jo.has("source") || source == null) return jo;
HashMap<String, int[]> map = new HashMap<String, int[]>();
map.put("used_cols", cols);
map.put("ignored_cols", ignored_cols);
for (String key : map.keySet()) {
int[] val = map.get(key);
if (val != null) {
if (val.length > 100) jo.getAsJsonObject("source").addProperty("num_" + key, val.length);
else if (val.length > 0) {
StringBuilder sb = new StringBuilder();
for (int c : val) sb.append(c + ",");
jo.getAsJsonObject("source")
.addProperty(key, sb.toString().substring(0, sb.length() - 1));
} else {
jo.getAsJsonObject("source").add(key, JsonNull.INSTANCE);
}
}
}
return jo;
}
