wangxianghu opened a new pull request #3007:
URL: https://github.com/apache/hudi/pull/3007
…rd to represent all the columns
## What is the purpose of the pull request
When the user wants to derive one or more columns from the existing columns
and the
existing columns are all needed, the user needs to spell all the columns
they need in the SQL.
This will be very troublesome and time-consuming when we have dozens or
hundreds of columns. we can save trouble by using a wildcard in the SQL to
represent all the columns.
that means if we have "id", "name", "age", "ts" these four columns already
and we want to add a new column driver from ts, we can use
"select *, FROM_UNIXTIME(ts / 1000, 'yyyyMMdd') as dt from table_name"
to represent
"select id, name, age, ts, FROM_UNIXTIME(ts / 1000, 'yyyyMMdd') as dt from
table_name"
## Brief change log
This pull request is already covered by existing tests, such as *(please
describe tests)*.
## Committer checklist
- [ ] Has a corresponding JIRA in PR title & commit
- [ ] Commit message is descriptive of the change
- [ ] CI is green
- [ ] Necessary doc changes done or have another open PR
- [ ] For large changes, please consider breaking it into sub-tasks under
an umbrella JIRA.
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