Github user twalthr commented on the pull request:
https://github.com/apache/flink/pull/1880#issuecomment-209938182
I will update the docs. The default values are defined in `CodeGenUtils`.
```
def primitiveDefaultValue(tpe: TypeInformation[_]): String = tpe match {
case INT_TYPE_INFO => "-1"
case LONG_TYPE_INFO => "-1"
case SHORT_TYPE_INFO => "-1"
case BYTE_TYPE_INFO => "-1"
case FLOAT_TYPE_INFO => "-1.0f"
case DOUBLE_TYPE_INFO => "-1.0d"
case BOOLEAN_TYPE_INFO => "false"
case STRING_TYPE_INFO => "\"\""
case CHAR_TYPE_INFO => "'\\0'"
case _ => "null"
}
```
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