[geomesa-dev] [JIRA] (GEOMESA-2779) Arrow - empty string for dictionary

["Emilio Lahr-Vivaz (JIRA)" <jira@xxxxxxxxxxxxxxxxxxxxx>]

Title: Message Title

Emilio Lahr-Vivaz created an issue

GeoMesa / GEOMESA-2779

Arrow - empty string for dictionary fields (vs null) is not handled correctly

Issue Type:	Bug
Assignee:	Unassigned
Created:	19/Feb/20 8:46 AM
Priority:	Major
Reporter:	Emilio Lahr-Vivaz

If an empty string is passed as "dictionary fields," ComplexArrowManualVisitor.results will throw a relatively unhelpful ArrayIndexOutOfBoundsException. It seems to be caused by this line:

val dictionaries = hints.get(ARROW_DICTIONARY_FIELDS).map(_.asInstanceOf[String].split(",").toSeq).getOrElse(Seq.empty)

(To my surprise)

"".split(",") == Array("")

So when ComplexArrowManualVisitor.results gets the SimpleFeatureType index of attribute "", it gets -1. And then when it uses that index to get the attribute, getAttribute throws an ArrayIndexOutOfBoundsException.

It seems reasonable that, in this context, an empty string passed for "dictionary fields" should be interpreted as an empty array.

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