lriggs opened a new pull request, #36184:
URL: https://github.com/apache/arrow/pull/36184
### Rationale for this change
substring_index("Abc.DE.fGh", '.', -2) returns "fGh" but it should return
"DE.fGh" (ie starting from the second occurrence of the delimiter from the
right). The proposed behavior matches the behavior of other databases.
### What changes are included in this PR?
Fixed reverse index calculation and updated unit tests.
### Are these changes tested?
Yes, unit tests and integration testing.
### Are there any user-facing changes?
Function behavior change with substring_index function.
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