yaooqinn opened a new pull request #26537: [SPARK-29587][SQL] Support SQL Standard type real as float(4) numeric as decimal URL: https://github.com/apache/spark/pull/26537 ### What changes were proposed in this pull request? The types decimal and numeric are equivalent. Both types are part of the SQL standard. the real type is 4 bytes, variable-precision, inexact, 6 decimal digits precision, same as our float ### Why are the changes needed? <!-- Please clarify why the changes are needed. For instance, 1. If you propose a new API, clarify the use case for a new API. 2. If you fix a bug, you can clarify why it is a bug. --> improve sql standard support other dbs https://www.postgresql.org/docs/9.3/datatype-numeric.html https://prestodb.io/docs/current/language/types.html#floating-point http://www.sqlservertutorial.net/sql-server-basics/sql-server-data-types/ MySQL treats REAL as a synonym for DOUBLE PRECISION (a nonstandard variation), unless the REAL_AS_FLOAT SQL mode is enabled. In MySQL, NUMERIC is implemented as DECIMAL, so the following remarks about DECIMAL apply equally to NUMERIC. ### 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'. --> no ### 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
---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
