beliefer opened a new pull request #24792: [WIP][SPARK-27943][SQL] Add new feature create table could specify column with default constraint URL: https://github.com/apache/spark/pull/24792 ## What changes were proposed in this pull request? Default constraint with column is ANSI standard. Hive 3.0+ has supported default constraint ref:https://issues.apache.org/jira/browse/HIVE-18726 But Spark SQL implement this feature not yet. This PR is related to [https://github.com/apache/spark/pull/24372](24372). If this PR finish, unselected target column can be inserted into the default value, while running `insert into`. After this PR, I will continue open other PR about default constraint, like alter table, desc table. There exists some issue in this PR: First, how to check a number specified by somebody compliance with the accuracy and scope of the data type, like float, double. Second, some code is not very elegant, I hope to improve it with your suggestions. ## How was this patch tested? UT
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