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https://issues.apache.org/jira/browse/HBASE-2323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benoit Sigoure updated HBASE-2323:
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Attachment: 0001-HBASE-2323-filter.RegexStringComparator-does-not-wor.patch
Patch rebased for 0.20. Stack's previous commit in 0.20 (#923387) was "lost"
when 0.20 was renamed {{0.20_pre_durability}}
> filter.RegexStringComparator does not work with certain bytes
> -------------------------------------------------------------
>
> Key: HBASE-2323
> URL: https://issues.apache.org/jira/browse/HBASE-2323
> Project: HBase
> Issue Type: Bug
> Components: filters
> Affects Versions: 0.20.3
> Reporter: Benoit Sigoure
> Assignee: Benoit Sigoure
> Fix For: 0.21.0
>
> Attachments:
> 0001-HBASE-2323-filter.RegexStringComparator-does-not-wor.patch,
> 0001-HBASE-2323-Kill-some-trailing-whitespaces.patch,
> 0002-HBASE-2323-Compile-the-pattern-with-DOTALL.patch,
> 0003-HBASE-2323-Allow-the-client-to-specify-a-custom-char.patch
>
>
> I'm trying to use {{RegexStringComparator}} in conjunction with
> {{RowFilter}}. One of my row keys contained the byte 0xA, which turns out to
> be the ASCII code for the newline character (\n). When the row key is
> converted to a string in order to use the regexp facility of the Java
> standard library, it becomes a string containing two lines and my regexp does
> not match.
> I believe the solution is to compile the regexp with the {{DOTALL}} flag.
> Luckily, this flag can be "passed" by the client by prefixing the regexp with
> {{(?s)}} so people working with an older version of HBase can work around
> this issue without having to upgrade.
> Second problem: One of my row keys contained the sequence {{0x00 0x00 0x9D}}
> ({{0x9D}} = -99 when stored in a Java {{byte}}) but in {{compareTo}} the row
> key is transformed in a {{String}} using {{Bytes.toString}}, which just
> assumes that the byte array is an UTF8 encoded string. Java "cleverly"
> substituted the 0x9D byte with 0x63 (character '?'). In my case, I want to
> use encoding ISO-8859-1 as it preserves every byte when the byte array is
> converted to a {{String}} and back to a byte array, unlike UTF-8 or ASCII.
> Should we add a new method to {{RegexStringComparator}} to allow the user to
> specify their own {{Charset}} instance?
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