mirror of https://github.com/apache/druid.git
78d0b0abce
* Add string comparison methods to StringUtils, fix dictionary comparisons. There are various places in Druid code where we assume that String.compareTo is consistent with Unicode code-point ordering. Sadly this is not the case. To help deal with this, this patch introduces the following helpers: 1) compareUnicode: Compares two Strings in Unicode code-point order. 2) compareUtf8: Compares two UTF-8 byte arrays in Unicode code-point order. Equivalent to comparison as unsigned bytes. 3) compareUtf8UsingJavaStringOrdering: Compares two UTF-8 byte arrays, or ByteBuffers, in a manner consistent with String.compareTo. There is no helper for comparing two Strings in a manner consistent with String.compareTo, because for that we can use compareTo directly. The patch also fixes an inconsistency between the String and UTF-8 dictionary GenericIndexed flavors of string-typed columns: they were formerly using incompatible comparators. * Adjust test. * FrontCodedIndexed updates. * Add test. * Fix comments. |
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