amaliujia commented on a change in pull request #35352:
URL: https://github.com/apache/spark/pull/35352#discussion_r827245478
##########
File path:
common/unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java
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@@ -999,13 +1000,22 @@ public static UTF8String concatWs(UTF8String separator,
UTF8String... inputs) {
}
public UTF8String[] split(UTF8String pattern, int limit) {
+ return split(pattern, limit, false);
+ }
+
+ public UTF8String[] split(UTF8String pattern, int limit, boolean ifQuote) {
Review comment:
Sure, this will be a very important decision and will change
implementation details. We should make a call before continuing checking other
code details.
Current split treats `pattern` as a regex, while split_part treats `pattern`
as a fixed string (or quoted regex pattern). Because we know that split_part
can be turned into ElementAt(split()), that is why I introduced branches into
existing code path: to re-use code as much as possible while maintaining minor
differences between function specs.
There are two principles:
1. Implement a function that is aligned with most of the vendors.
2. Re-use code as much as possible.
Thus leads to two options:
Option 1: we implement split_part separately without re-using element_at and
split, this will make the behavior compatible with others but might not produce
minimal code addition.
Option 2: we change split_part to follow split, thus leads to very nice
code re-use, but our split will be pretty unique.
What do you think @cloud-fan @srielau?
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