Support for HBase Java comparators

MapR-DB supports the following Java filters, which work identically to their Apache HBase versions.

Comparator Description
BinaryComparator

A binary comparator which lexicographically compares against the specified byte array using Bytes.compareTo(byte[], byte[]).
BinaryPrefixComparator A comparator which compares against a specified byte array, but only compares up to the length of this byte array. For the rest it is similar to BinaryComparator.

BitComparator

A bit comparator which performs the specified bitwise operation on each of the bytes with the specified byte array. Then returns whether the result is non-zero.
NullComparator A binary comparator which lexicographically compares against the specified byte array using Bytes.compareTo(byte[], byte[]).
RegexStringComparator This comparator is for use with CompareFilter implementations, such as RowFilter , QualifierFilter , and ValueFilter , for filtering based on the value of a given column. Use it to test if a given regular expression matches a cell value in the column.

Only EQUAL or NOT_EQUAL comparisons are valid with this comparator.

For example:

 ValueFilter vf = new ValueFilter(CompareOp.EQUAL,
     new RegexStringComparator(
       // v4 IP address
       "(((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3,3}" +
         "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))(\\/[0-9]+)?" +
         "|" +
       // v6 IP address
       "((([\\dA-Fa-f]{1,4}:){7}[\\dA-Fa-f]{1,4})(:([\\d]{1,3}.)" +
         "{3}[\\d]{1,3})?)(\\/[0-9]+)?"));
SubstringComparator This comparator is for use with SingleColumnValueFilter, for filtering based on the value of a given column. Use it to test if a given substring appears in a cell value in the column. The comparison is case insensitive.

Only EQUAL or NOT_EQUAL tests are valid with this comparator.

For example:

 SingleColumnValueFilter scvf =
   new SingleColumnValueFilter("col", CompareOp.EQUAL,
     new SubstringComparator("substr"));