Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/17711#discussion_r112655646 --- Diff: sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 --- @@ -547,6 +547,10 @@ valueExpression | left=valueExpression comparisonOperator right=valueExpression #comparison ; +builtinOpExpression + : primaryExpression (CONCAT_PIPE primaryExpression)* #concat --- End diff -- Currently, it seems we have the same behaviour with mysql; ``` mysql> select 1 + 2 || '3'; +--------------+ | 1 + 2 || '3' | +--------------+ | 24 | +--------------+ 1 row in set (0.00 sec) postgres=# select 1 + 2 || '3'; ?column? ---------- 33 (1 row) scala> sql("""select 1 + 2 || '3'""").show +------------------------------------------------------------------+ |(CAST(1 AS DOUBLE) + CAST(concat(CAST(2 AS STRING), 3) AS DOUBLE))| +------------------------------------------------------------------+ | 24.0| +------------------------------------------------------------------+ ```
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