xiaoyong-z opened a new pull request, #4995: URL: https://github.com/apache/arrow-datafusion/pull/4995
To know the columns/types in a file, users has to create an external table, and describe the table. Sometimes the infer schema is wrong for creating table, to make it right, user need to drop the table, and recreate a table with the specify schema. To solve this problem, we add describe file interface in datafusion-clie, With the Describe File, user can know the infer schema is wrong before creating the table. Syntax: Describe file_path, Example: DESCRIBE 'tests/data/aggregate_simple_pipe.csv'; Return: column_name data_type is_nullable c1 Float32 NO c2 Float64 NO c3 Boolean NO Signed-off-by: xyz <[email protected]> # Which issue does this PR close? <!-- We generally require a GitHub issue to be filed for all bug fixes and enhancements and this helps us generate change logs for our releases. You can link an issue to this PR using the GitHub syntax. For example `Closes #123` indicates that this PR will close issue #123. --> Closes #4913 # Rationale for this change <!-- Why are you proposing this change? If this is already explained clearly in the issue then this section is not needed. Explaining clearly why changes are proposed helps reviewers understand your changes and offer better suggestions for fixes. --> # What changes are included in this PR? <!-- There is no need to duplicate the description in the issue here but it is sometimes worth providing a summary of the individual changes in this PR. --> # Are these changes tested? <!-- We typically require tests for all PRs in order to: 1. Prevent the code from being accidentally broken by subsequent changes 2. Serve as another way to document the expected behavior of the code If tests are not included in your PR, please explain why (for example, are they covered by existing tests)? --> # Are there any user-facing changes? <!-- If there are user-facing changes then we may require documentation to be updated before approving the PR. --> <!-- If there are any breaking changes to public APIs, please add the `api change` label. --> -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
