guiyanakuang opened a new pull request #943:
URL: https://github.com/apache/orc/pull/943
### What changes were proposed in this pull request?
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This matching algorithm is wrong when i does not backtrack after a failed
match in the middle. As a simple example data = OOORC, pattern= ORC, index = 1,
this algorithm will return -1.
This pr aims to fix the indexOf algorithm.
### Why are the changes needed?
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indexOf is used to find the ORC file ending identifier to recover the file,
it is important to ensure that the method is correct.
### How was this patch tested?
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Add UT.
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