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#### What changes were proposed in this pull request? Ensure that all built-in expressions can be mapped to its SQL representation if there is one (e.g. ScalaUDF doesn't have a SQL representation). The function lists are from the expression list in `FunctionRegistry`. window functions, grouping sets functions (`cube`, `rollup`, `grouping`, `grouping_id`), generator functions (`explode` and `json_tuple`) are covered by separate JIRA and PRs. Thus, this PR does not cover them. Except these functions, all the built-in expressions are covered. For details, see the list in `ExpressionToSQLSuite`. Fixed a few issues. For example, the `prettyName` of `approx_count_distinct` is not right. The `sql` of `hash` function is not right, since the `hash` function does not accept `seed`. Additionally, also correct the order of expressions in `FunctionRegistry` so that people are easier to find which functions are missing. cc liancheng #### How was the this patch tested? Added two test cases in LogicalPlanToSQLSuite for covering `not like` and `not in`. Added a new test suite `ExpressionToSQLSuite` to cover the functions: 1. misc non-aggregate functions + complex type creators + null expressions 2. math functions 3. aggregate functions 4. string functions 5. date time functions + calendar interval 6. collection functions 7. misc functions Author: gatorsmile <gatorsmile@gmail.com> Closes #11314 from gatorsmile/expressionToSQL. |
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