Wan Kun created SPARK-53552:
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Summary: Optimize substr SQL function
Key: SPARK-53552
URL: https://issues.apache.org/jira/browse/SPARK-53552
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 4.1.0
Reporter: Wan Kun
In substringSQL() functions, if pos > 0 then we don't need to calculate
numChars().
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