Github user mengxr commented on a diff in the pull request:

    https://github.com/apache/spark/pull/6762#discussion_r34066113
  
    --- Diff: 
unsafe/src/test/java/org/apache/spark/unsafe/types/UTF8StringSuite.java ---
    @@ -88,4 +88,57 @@ public void substring() {
         Assert.assertEquals(
           UTF8String.fromString("数据砖头").substring(3, 5), 
UTF8String.fromString("头"));
       }
    +
    +  @Test
    +  public void trims() {
    +    Assert.assertEquals(
    +            UTF8String.fromString("  hello ").trim(), 
UTF8String.fromString("hello"));
    +    Assert.assertEquals(
    +            UTF8String.fromString("  hello ").trimLeft(), 
UTF8String.fromString("hello "));
    +    Assert.assertEquals(
    +            UTF8String.fromString("  hello ").trimRight(), 
UTF8String.fromString("  hello"));
    +
    +    Assert.assertEquals(
    +            UTF8String.fromString("  数据砖头 ").trim(), 
UTF8String.fromString("数据砖头"));
    +    Assert.assertEquals(
    +            UTF8String.fromString("  数据砖头 ").trimLeft(), 
UTF8String.fromString("数据砖头 "));
    +    Assert.assertEquals(
    +            UTF8String.fromString("  数据砖头 ").trimRight(), 
UTF8String.fromString("  数据砖头"));
    +
    +    Assert.assertEquals(
    +            UTF8String.fromString("数据砖头").trim(), 
UTF8String.fromString("数据砖头"));
    +    Assert.assertEquals(
    +            UTF8String.fromString("数据砖头").trimLeft(), 
UTF8String.fromString("数据砖头"));
    +    Assert.assertEquals(
    +            UTF8String.fromString("数据砖头").trimRight(), 
UTF8String.fromString("数据砖头"));
    +  }
    +
    +  @Test
    +  public void instr() {
    +    Assert.assertEquals(
    +            
UTF8String.fromString("hello").instr(UTF8String.fromString("l"), 0), 2);
    +    Assert.assertEquals(
    +            
UTF8String.fromString("hello").instr(UTF8String.fromString("l"), 3), 3);
    +    Assert.assertEquals(
    +            
UTF8String.fromString("hello").instr(UTF8String.fromString("a"), 0), -1);
    +
    +    Assert.assertEquals(
    +            UTF8String.fromString("数据ç 
–头").instr(UTF8String.fromString("据砖"), 0), 1);
    +    Assert.assertEquals(
    +            UTF8String.fromString("数据ç 
–头").instr(UTF8String.fromString("数"), 3), -1);
    +    Assert.assertEquals(
    +            UTF8String.fromString("数据ç 
–头").instr(UTF8String.fromString("数"), 0), 0);
    +    Assert.assertEquals(
    +            UTF8String.fromString("数据ç 
–头").instr(UTF8String.fromString("头"), 0), 3);
    +  }
    +
    +  @Test
    +  public void reverse() {
    +    Assert.assertEquals(
    +            UTF8String.fromString("hello").reverse(), 
UTF8String.fromString("olleh"));
    +    Assert.assertEquals(
    +            UTF8String.fromString("").reverse(), 
UTF8String.fromString(""));
    +    Assert.assertEquals(
    +            UTF8String.fromString("数据砖头").reverse(), 
UTF8String.fromString("头砖据数"));
    --- End diff --
    
    minor: we can change `数据砖头` to `孙行者` and then `头砖据数` 
to `者行孙` ~ :D


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