LiShuMing opened a new pull request #25288: [SPARK-28036] [SQL] Built-in udf left/right has inconsistent behavior with postgresql URL: https://github.com/apache/spark/pull/25288 ## What changes were proposed in this pull request? Support build-in udf left/right to be consistent with PostgreSQL. ## How was this patch tested? Add `Left / Right` unittest in `org.apache.spark.sql.catalyst.expressions.StringExpressionsSuite`; cc @wangyum .
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