[GLUTEN-6127] [VL] When the regexExpr of the split function is an empty character or a non-ASCII character, fall back to Valina Spark #6128
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What changes were proposed in this pull request?
Currently Velox's split function's regexExpr does not support empty characters and non-ASCII characters. We should fall back to Valina Spark first.
How was this patch tested?
unit tests