update dialect to get columns based on DESCRIBE #20
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Will review this shortly |
sbaldwin-rs
reviewed
May 30, 2024
| "sqlalchemy.dialects": [ | ||
| "rockset_sqlalchemy = rockset_sqlalchemy.sqlalchemy:RocksetDialect", | ||
| "rockset = rockset_sqlalchemy.sqlalchemy:RocksetDialect" | ||
| "rockset = rockset_sqlalchemy.sqlalchemy:RocksetDialect", |
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The version needs to be bumped, right?
sbaldwin-rs
reviewed
May 30, 2024
| return columns | ||
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| def _validate_query(self, connection: Engine, query: str): | ||
| import rockset.models |
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Any reason not to have this import at the top of the file?
sbaldwin-rs
reviewed
May 30, 2024
| if not isinstance(max_field_depth, int): | ||
| raise ValueError("Query option max_field_depth, must be of type 'int'") | ||
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| q = f"DESCRIBE {table_name} OPTION(max_field_depth={max_field_depth})" |
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The schema needs to be in the DESCRIBE query, no?
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Summary
This attempts to fix #19
Currently, if you try to fetch the columns of the table, it will
select * from collection limit 1which assumes a fixed schema.This PR adds a version of this implementation, but instead uses
describe collection option(max_field_depth=1)wheremax_field_depthis configurable. There are two minor caveatsdescribemethod, does not return the_metafield whereas theselectmethod would.describeso if aRocksetExceptionis thrown, it will fall back to theselectmethod. The format of the response is the same so there shouldn't be too many surprises.Misc
Tests