1) You can find the public headers in c++/include/orc. All the classes and methods have good documentation in the code. You can also take a look at the sample c++ codes under tools/src, especially FileContents.cc<http://FileContents.cc> and FileScan.cc<http://FileScan.cc>. Both demonstrate the usage of c++ reader.
2) What you are mentioning is a feature we call “Predicate Pushdown”. Unfortunately it is not supported by c++ reader currently. The java reader does support it through SearchArgument class. I assume the implementation would be similar for c++ when we add this support in the future. On Nov 1, 2018, at 1:28 PM, Korry Douglas <[email protected]<mailto:[email protected]>> wrote: Hi all - I’m an absolute ORC newbie so please forgive the novice questions. I’m trying to use the C++ API to implement a reader. I have two questions (to start with): 1) I’ve been reading the docs at https://orc.apache.org/docs/core-cpp.html - is there more complete documentation that describes all of the public classes that I can use? 2) My understanding is that an ORC file contains min/max indexes that can help me reduce the amount of data I have to read to satisfy a given query. Is there a class that I can use to specify the range of values that I want to read? Or do I have to read the statistics myself (for each stripe?) and manually inspect the min/max values. Thanks in advance. — Korry
