[SPARK-53552][SQL] Optimize substr SQL function #52308
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cloud-fan
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Sep 12, 2025
common/unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java
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cloud-fan
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Sep 12, 2025
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What changes were proposed in this pull request?
In substringSQL() functions, if pos > 0 then we don't need to calculate numChars().
Why are the changes needed?
SQL function substr performance improvement.
Does this PR introduce any user-facing change?
No
How was this patch tested?
Exists UT
Was this patch authored or co-authored using generative AI tooling?
No