[SPARK-48281][SQL] Alter string search logic for UTF8_BINARY_LCASE collation (StringInStr, SubstringIndex) #46589
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
uros-db
changed the title
mkaravel
reviewed
May 16, 2024
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationAwareUTF8String.java
Outdated
Show resolved
Hide resolved
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationAwareUTF8String.java
Outdated
Show resolved
Hide resolved
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationAwareUTF8String.java
Outdated
Show resolved
Hide resolved
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationAwareUTF8String.java
Outdated
Show resolved
Hide resolved
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationAwareUTF8String.java
Outdated
Show resolved
Hide resolved
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationAwareUTF8String.java
Outdated
Show resolved
Hide resolved
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationAwareUTF8String.java
Outdated
Show resolved
Hide resolved
common/unsafe/src/test/java/org/apache/spark/unsafe/types/CollationSupportSuite.java
Show resolved
Hide resolved
common/unsafe/src/test/java/org/apache/spark/unsafe/types/CollationSupportSuite.java
Show resolved
Hide resolved
common/unsafe/src/test/java/org/apache/spark/unsafe/types/CollationSupportSuite.java
Show resolved
Hide resolved
mkaravel
approved these changes
May 20, 2024
|
Please update the PR description. |
uros-db
changed the title
uros-db
commented
May 21, 2024
dbatomic
approved these changes
May 28, 2024
|
please fix merge conflicts. |
|
thanks, merging to master! |
riyaverm-db
pushed a commit
to riyaverm-db/spark
that referenced
this pull request
Jun 7, 2024
…llation (StringInStr, SubstringIndex)
### What changes were proposed in this pull request?
String searching in UTF8_BINARY_LCASE now works on character-level, rather than on byte-level. For example: `instr("İ", "i")`; now returns 0, because there exists no `start, len` such that `lowercase(substring("İ", start, len)) == "i"`.
### Why are the changes needed?
Fix functions that give unusable results due to one-to-many case mapping when performing string search under UTF8_BINARY_LCASE (see example above).
### Does this PR introduce _any_ user-facing change?
Yes, behaviour of `instr` and `substring_index` expressions is changed for edge cases with one-to-many case mapping.
### How was this patch tested?
New unit tests in `CollationSupportSuite`.
### Was this patch authored or co-authored using generative AI tooling?
No.
Closes apache#46589 from uros-db/alter-lcase-vol2.
Authored-by: Uros Bojanic <[email protected]>
Signed-off-by: Wenchen Fan <[email protected]>
cloud-fan
pushed a commit
that referenced
this pull request
Jun 11, 2024
### What changes were proposed in this pull request? Renaming `UTF8_BINARY_LCASE` collation to `UTF8_LCASE`. ### Why are the changes needed? As part of the collation effort in Spark, we've moved away from byte-by-byte logic towards character-by-character logic, so what we used to call `UTF8_BINARY_LCASE` is now more precisely `UTF8_LCASE`. For example, string searching in UTF8_LCASE now works on character-level (rather than on byte-level), which is reflected in this PRs: #46511, #46589, #46682, #46761, #46762. In addition, string comparison also works on character-level now, as per the changes introduced in this PR: #46700. ### Does this PR introduce _any_ user-facing change? Yes, what was previously named `UTF8_BINARY_LCASE` collation, will from now on be named `UTF8_LCASE`. ### How was this patch tested? Existing tests. ### Was this patch authored or co-authored using generative AI tooling? No. Closes #46924 from uros-db/rename-lcase. Authored-by: Uros Bojanic <[email protected]> Signed-off-by: Wenchen Fan <[email protected]>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
What changes were proposed in this pull request?
String searching in UTF8_BINARY_LCASE now works on character-level, rather than on byte-level. For example:
instr("İ", "i"); now returns 0, because there exists nostart, lensuch thatlowercase(substring("İ", start, len)) == "i".Why are the changes needed?
Fix functions that give unusable results due to one-to-many case mapping when performing string search under UTF8_BINARY_LCASE (see example above).
Does this PR introduce any user-facing change?
Yes, behaviour of
instrandsubstring_indexexpressions is changed for edge cases with one-to-many case mapping.How was this patch tested?
New unit tests in
CollationSupportSuite.Was this patch authored or co-authored using generative AI tooling?
No.