truncation of Char[>1] fields to one character.
reproduction with simple VDB (to be attached):

SELECT asChar,asVarChar,asInt FROM "TestErrors"."TruncateCHAR";

the "asChar" field only returns a "C" and the asVarChar returns the complete value.

That is the expected behavior, per the Data Virtualization Reference Manual, char datatype is a single Unicode character (java.lang.Character). However, the importer may need to check for the occurrence of char[n+] and not assume char[1].