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https://issues.apache.org/jira/browse/ORC-115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15726351#comment-15726351
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Owen O'Malley commented on ORC-115:
-----------------------------------
As I mentioned on the user list, when you are trying to understand what is
going on with an ORC file, it is useful to use the tools jar. It allows you to
see both the metadata and contents of the file depending on the options. If you
build the C++, there are equivalent tools there (orc-contents and orc-metadata).
> Unable to write string data into ORC file (or at least read it back)
> --------------------------------------------------------------------
>
> Key: ORC-115
> URL: https://issues.apache.org/jira/browse/ORC-115
> Project: Orc
> Issue Type: Bug
> Components: Java
> Affects Versions: 1.2.2
> Reporter: Scott Wells
> Assignee: Owen O'Malley
> Fix For: 1.2.3, 1.3.0
>
>
> I'm trying to create a little utility to convert CSV files into ORC files.
> I've noticed that the resulting ORC files don't seem quite correct, though.
> In an effort to create a simple reproducible test case, I just changed the
> "Writing/Reading ORC Files" examples here:
> https://orc.apache.org/docs/core-java.html
> to create a file based on a pair of strings instead of integers. Basically I
> changed the loop as follows:
> {code}
> BytesColumnVector first = (BytesColumnVector) writeBatch.cols[0];
> BytesColumnVector last = (BytesColumnVector) writeBatch.cols[1];
> for (int r = 0; r < 10; ++r)
> {
> String firstName = ("First-" + r).intern();
> String lastName = ("Last-" + (r * 3)).intern();
> ...
> }
> {code}
> The file writes without errors, and if I write it with no compression, I can
> see the data using {{strings my-file.orc}}. However, when I then try to read
> the data back from the file and print out the resulting batches to the
> console, I get the following:
> {noformat}
> [" ", " "]
> [" ", " "]
> [" ", " "]
> [" ", " "]
> [" ", " "]
> [" ", " "]
> [" ", " "]
> [" ", " "]
> [" ", " "]
> [" ", " "]
> {noformat}
> I've been completely unable to find any documentation or example code that
> would help me to understand why this isn't working. Any insights about what
> I may be doing wrong here would be greatly appreciated!
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