Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/6804#discussion_r32690229 --- Diff: unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java --- @@ -125,30 +129,37 @@ public UTF8String substring(final int start, final int until) { } public boolean contains(final UTF8String substring) { + if (substring == null) return false; final byte[] b = substring.getBytes(); if (b.length == 0) { return true; } for (int i = 0; i <= bytes.length - b.length; i++) { - // TODO: Avoid copying. - if (bytes[i] == b[0] && Arrays.equals(Arrays.copyOfRange(bytes, i, i + b.length), b)) { + if (bytes[i] == b[0] && startsWith(b, i)) { return true; } } return false; } + private boolean startsWith(final byte[] prefix, int offset) { --- End diff -- how about remaining it offsetInBytes?
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