[FLINK-1820] Bug in DoubleParser and FloatParser - empty String is not casted to 0

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.8.0, 0.9, 0.8.1
• Fix Version/s: 0.9
• Assignee: Felix Neutatz
• Reporter: Felix Neutatz
• Created: 02/Apr/15 22:03
• Updated: 28/Feb/19 13:21
• Resolved: 19/May/15 07:55

Description

Hi,

I found the bug, when I wanted to read a csv file, which had a line like:
"||\n"

If I treat it as a Tuple2<Long,Long>, I get as expected a tuple (0L,0L).

But if I want to read it into a Double-Tuple or a Float-Tuple, I get the following error:

java.lang.AssertionError: Test failed due to a org.apache.flink.api.common.io.ParseException: Line could not be parsed: '||'
ParserError NUMERIC_VALUE_FORMAT_ERROR

This error can be solved by adding an additional condition for empty strings in the FloatParser / DoubleParser.

We definitely need the CSVReader to be able to read "empty values".

I can fix it like described if there are no better ideas