Nested JSON breaks connection to impala about impala-get-json-object-udf

[ajfg93]

@scratch28

replace this line

impala-get-json-object-udf/jsonUdf.cc

Line 71 in 49e151f

if (va.HasMember(key)) { \

to

    if (va.IsObject() && va.HasMember(key)) { \

and recompile.

IsObject() needs to be checked before calling HasMember.

See from rapidson/document.h:

#if RAPIDJSON_HAS_STDSTRING
    //! Check whether a member exists in the object with string object.
    /*!
        \param name Member name to be searched.
        \pre IsObject() == true
        \return Whether a member with that name exists.
        \note It is better to use FindMember() directly if you need the obtain the value as well.
        \note Linear time complexity.
    */
    bool HasMember(const std::basic_string<Ch>& name) const { return FindMember(name) != MemberEnd(); }
#endif

\pre IsObject() == true, I thint that means pre-condition.