wangyum opened a new pull request #24859: [SPARK-28033][SQL] String concatenation low priority than other arithmeticBinary URL: https://github.com/apache/spark/pull/24859 ## What changes were proposed in this pull request? This pr make string concatenation(`'||'`) low priority than other operators, for example: ```sql spark-sql> select 'four: ' || 2 + 2; NULL spark-sql> select 'zero: ' || 2 ^ 2; Error in query: cannot resolve '(CAST(concat('zero: ', CAST(2 AS STRING)) AS DOUBLE) ^ 2)' due to data type mismatch: differing types in '(CAST(concat('zero: ', CAST(2 AS STRING)) AS DOUBLE) ^ 2)' (double and int).; line 1 pos 7; 'Project [unresolvedalias((cast(concat(zero: , cast(2 as string)) as double) ^ 2), None)] +- OneRowRelation ``` ```sql hive> select 'four: ' || 2 + 2; OK four: 4 Time taken: 1.774 seconds, Fetched: 1 row(s) hive> select 'zero: ' || 2 ^ 2; OK zero: 0 Time taken: 1.651 seconds, Fetched: 1 row(s) ``` ## How was this patch tested? unit tests
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