yaooqinn opened a new pull request #26599: [SPARK-29961][SQL] Implement builtin function - typeof URL: https://github.com/apache/spark/pull/26599 ### What changes were proposed in this pull request? Add typeof function for Spark to get the underlying type of value. ```sql -- !query 0 select typeof(1) -- !query 0 schema struct<typeof(1):string> -- !query 0 output int -- !query 1 select typeof(1.2) -- !query 1 schema struct<typeof(1.2):string> -- !query 1 output decimal(2,1) -- !query 2 select typeof(array(1, 2)) -- !query 2 schema struct<typeof(array(1, 2)):string> -- !query 2 output array<int> -- !query 3 select typeof(a) from (values (1), (2), (3.1)) t(a) -- !query 3 schema struct<typeof(a):string> -- !query 3 output decimal(11,1) decimal(11,1) decimal(11,1) ``` ##### presto ```sql presto> select typeof(array[1]); _col0 ---------------- array(integer) (1 row) ``` ##### PostgreSQL ```sql postgres=# select pg_typeof(a) from (values (1), (2), (3.0)) t(a); pg_typeof ----------- numeric numeric numeric (3 rows) ``` ##### impala https://issues.apache.org/jira/browse/IMPALA-1597 ### Why are the changes needed? a function which is better we have to help us debug, test, develop ... ### Does this PR introduce any user-facing change? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If no, write 'No'. --> add a new function ### How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to add some test cases that check the changes thoroughly including negative and positive cases if possible. If it was tested in a way different from regular unit tests, please clarify how you tested step by step, ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future. If tests were not added, please describe why they were not added and/or why it was difficult to add. --> add ut and example
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